我尝试在iOS 8中创建一个自定义键盘来取代现有的键盘。我真的搜索了一下，但无法找到是否有可能创造一个比现有iOS键盘更高的键盘。我替换了UIInputView，但无法改变可用的高度。
这是我在Xcode 6.0 GM上的代码，两种方向都支持
更新:多亏了@SoftDesigner，我们现在可以消除constraint conflict警告了。
警告: XIB和storyboard未被测试。有些人报告说这对XIB不起作用。
KeyboardViewController.h
#import <UIKit/UIKit.h>
@interface KeyboardViewController : UIInputViewController
@property (nonatomic) CGFloat portraitHeight;
@property (nonatomic) CGFloat landscapeHeight;
@property (nonatomic) BOOL isLandscape;
@property (nonatomic) NSLayoutConstraint *heightConstraint;
@property (nonatomic) UIButton *nextKeyboardButton;
@end
KeyboardViewController.m
#import "KeyboardViewController.h"
@interface KeyboardViewController ()
@end
@implementation KeyboardViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Perform custom initialization work here
self.portraitHeight = 256;
self.landscapeHeight = 203;
}
return self;
}
- (void)updateViewConstraints {
[super updateViewConstraints];
// Add custom view sizing constraints here
if (self.view.frame.size.width == 0 || self.view.frame.size.height == 0)
return;
[self.inputView removeConstraint:self.heightConstraint];
CGSize screenSize = [[UIScreen mainScreen] bounds].size;
CGFloat screenH = screenSize.height;
CGFloat screenW = screenSize.width;
BOOL isLandscape = !(self.view.frame.size.width ==
(screenW*(screenW<screenH))+(screenH*(screenW>screenH)));
NSLog(isLandscape ? @"Screen: Landscape" : @"Screen: Potriaint");
self.isLandscape = isLandscape;
if (isLandscape) {
self.heightConstraint.constant = self.landscapeHeight;
[self.inputView addConstraint:self.heightConstraint];
} else {
self.heightConstraint.constant = self.portraitHeight;
[self.inputView addConstraint:self.heightConstraint];
}
}
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
}
- (void)viewDidLoad {
[super viewDidLoad];
// Perform custom UI setup here
self.nextKeyboardButton = [UIButton buttonWithType:UIButtonTypeSystem];
[self.nextKeyboardButton setTitle:NSLocalizedString(@"Next Keyboard", @"Title for 'Next Keyboard' button") forState:UIControlStateNormal];
[self.nextKeyboardButton sizeToFit];
self.nextKeyboardButton.translatesAutoresizingMaskIntoConstraints = NO;
[self.nextKeyboardButton addTarget:self action:@selector(advanceToNextInputMode) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:self.nextKeyboardButton];
NSLayoutConstraint *nextKeyboardButtonLeftSideConstraint = [NSLayoutConstraint constraintWithItem:self.nextKeyboardButton attribute:NSLayoutAttributeLeft relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeLeft multiplier:1.0 constant:0.0];
NSLayoutConstraint *nextKeyboardButtonBottomConstraint = [NSLayoutConstraint constraintWithItem:self.nextKeyboardButton attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeBottom multiplier:1.0 constant:0.0];
[self.view addConstraints:@[nextKeyboardButtonLeftSideConstraint, nextKeyboardButtonBottomConstraint]];
self.heightConstraint = [NSLayoutConstraint constraintWithItem:self.inputView attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:0.0 constant:self.portraitHeight];
self.heightConstraint.priority = UILayoutPriorityRequired - 1; // This will eliminate the constraint conflict warning.
}
- (void)textWillChange:(id<UITextInput>)textInput {
// The app is about to change the document's contents. Perform any preparation here.
}
- (void)textDidChange:(id<UITextInput>)textInput {
}
@end
class KeyboardViewController: UIInputViewController {
@IBOutlet var nextKeyboardButton: UIButton!
let portraitHeight:CGFloat = 256.0
let landscapeHeight:CGFloat = 203.0
var heightConstraint: NSLayoutConstraint?
override func updateViewConstraints() {
super.updateViewConstraints()
// Add custom view sizing constraints here
if (self.view.frame.size.width == 0 || self.view.frame.size.height == 0) {
return
}
inputView.removeConstraint(heightConstraint!)
let screenSize = UIScreen.mainScreen().bounds.size
let screenH = screenSize.height;
let screenW = screenSize.width;
let isLandscape = !(self.view.frame.size.width == screenW * ((screenW < screenH) ? 1 : 0) + screenH * ((screenW > screenH) ? 1 : 0))
NSLog(isLandscape ? "Screen: Landscape" : "Screen: Potriaint");
if (isLandscape) {
heightConstraint!.constant = landscapeHeight;
inputView.addConstraint(heightConstraint!)
} else {
heightConstraint!.constant = self.portraitHeight;
inputView.addConstraint(heightConstraint!)
}
}
override func viewDidLoad() {
super.viewDidLoad()
// Perform custom UI setup here
self.nextKeyboardButton = UIButton.buttonWithType(.System) as UIButton
self.nextKeyboardButton.setTitle(NSLocalizedString("Next Keyboard", comment: "Title for 'Next Keyboard' button"), forState: .Normal)
self.nextKeyboardButton.sizeToFit()
self.nextKeyboardButton.setTranslatesAutoresizingMaskIntoConstraints(false)
self.nextKeyboardButton.addTarget(self, action: "advanceToNextInputMode", forControlEvents: .TouchUpInside)
self.view.addSubview(self.nextKeyboardButton)
var nextKeyboardButtonLeftSideConstraint = NSLayoutConstraint(item: self.nextKeyboardButton, attribute: .Left, relatedBy: .Equal, toItem: self.view, attribute: .Left, multiplier: 1.0, constant: 0.0)
var nextKeyboardButtonBottomConstraint = NSLayoutConstraint(item: self.nextKeyboardButton, attribute: .Bottom, relatedBy: .Equal, toItem: self.view, attribute: .Bottom, multiplier: 1.0, constant: 0.0)
self.view.addConstraints([nextKeyboardButtonLeftSideConstraint, nextKeyboardButtonBottomConstraint])
heightConstraint = NSLayoutConstraint(item: self.inputView, attribute: NSLayoutAttribute.Height, relatedBy: NSLayoutRelation.Equal, toItem: nil, attribute: NSLayoutAttribute.NotAnAttribute, multiplier: 1.0, constant: portraitHeight)
heightConstraint!.priority = 999.0
}
override func textWillChange(textInput: UITextInput) {
// The app is about to change the document's contents. Perform any preparation here.
}
override func textDidChange(textInput: UITextInput) {
// The app has just changed the document's contents, the document context has been updated.
var textColor: UIColor
var proxy = self.textDocumentProxy as UITextDocumentProxy
if proxy.keyboardAppearance == UIKeyboardAppearance.Dark {
textColor = UIColor.whiteColor()
} else {
textColor = UIColor.blackColor()
}
self.nextKeyboardButton.setTitleColor(textColor, forState: .Normal)
}
}
最近，苹果更新了他们的应用程序扩展编程指南，以改变自定义键盘扩展的高度:
CGFloat _expandedHeight = 500;
NSLayoutConstraint *_heightConstraint = [NSLayoutConstraint constraintWithItem:self.view attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:0.0 constant: _expandedHeight];
[self.view addConstraint: _heightConstraint];
这是我发现的使高度正确更新的最小解决方案。似乎有两个关键组成部分:
- 需要将
translatesAutoresizingMaskIntoConstraints设置为false的视图添加到视图层次中。 - 不需要在
viewWillAppear之前添加高度约束。
我仍然在日志中看到Unable to simultaneously satisfy constraints错误，但无论如何它似乎都可以工作。我还看到一个跳跃，其中高度最初被设置为默认值，然后跳转到设定值。我还没有找到解决这两个问题的方法。
import UIKit
class KeyboardViewController: UIInputViewController {
var heightConstraint: NSLayoutConstraint!
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(animated)
self.inputView.addConstraint(self.heightConstraint)
}
override func viewDidLoad() {
super.viewDidLoad()
let dummyView = UILabel(frame:CGRectZero)
dummyView.setTranslatesAutoresizingMaskIntoConstraints(false)
self.view.addSubview(dummyView);
let height : CGFloat = 400
self.heightConstraint = NSLayoutConstraint( item:self.inputView, attribute:.Height, relatedBy:.Equal, toItem:nil, attribute:.NotAnAttribute, multiplier:0.0, constant:height)
}
}
Swift 4更新:
import UIKit
class KeyboardViewController: UIInputViewController
{
private weak var _heightConstraint: NSLayoutConstraint?
override func viewWillAppear(_ animated: Bool)
{
super.viewWillAppear(animated)
guard nil == _heightConstraint else { return }
// We must add a subview with an `instrinsicContentSize` that uses autolayout to force the height constraint to be recognized.
//
let emptyView = UILabel(frame: .zero)
emptyView.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(emptyView);
let heightConstraint = NSLayoutConstraint(item: view,
attribute: .height,
relatedBy: .equal,
toItem: nil,
attribute: .notAnAttribute,
multiplier: 0.0,
constant: 240)
heightConstraint.priority = .required - 1
view.addConstraint(heightConstraint)
_heightConstraint = heightConstraint
}
}
接受的答案不适合iOS 9。我将其中的部分内容与其他一些建议结合在一起，并将其与苹果应用扩展编程指南中的代码结合在一起。
这个解决方案非常有效，因为它不会延迟修改高度直到viewDidAppear，并且在旋转时，您可以根据屏幕大小更改高度。已验证此功能在iOS 8和9中有效
几个重要的注意事项:
~ inputView中至少有一个元素需要使用自动布局
~高度约束在viewWillAppear之前不能被激活
~需要降低高度约束的priority以避免不满意的约束
~ updateViewConstraints是设置所需高度的好地方
提示:在模拟器上测试时，我发现它很脆弱，会有意想不到的行为。如果它这样对你，重置模拟器并再次运行。或者你可以禁用键盘并重新添加它。
注意:
~这个功能目前在iOS 10测试版中不支持。当它出现时，它会正确地改变高度，但如果你旋转设备，高度不会改变。这是因为updateViewConstraints在旋转时没有被触发。请提交iOS 10的bug报告。为了解决这个问题，您可以在viewDidLayoutSubviews中触发constant更改。
var nextKeyboardButton: UIButton!
var heightConstraint: NSLayoutConstraint?
override func viewDidLoad() {
super.viewDidLoad()
self.nextKeyboardButton = UIButton(type: .System)
self.nextKeyboardButton.setTitle(NSLocalizedString("Next Keyboard", comment: "Title for 'Next Keyboard' button"), forState: .Normal)
self.nextKeyboardButton.sizeToFit()
self.nextKeyboardButton.translatesAutoresizingMaskIntoConstraints = false
self.nextKeyboardButton.addTarget(self, action: "advanceToNextInputMode", forControlEvents: .TouchUpInside)
self.view.addSubview(self.nextKeyboardButton)
let nextKeyboardButtonLeftSideConstraint = NSLayoutConstraint(item: self.nextKeyboardButton, attribute: .Left, relatedBy: .Equal, toItem: self.view, attribute: .Left, multiplier: 1, constant: 0)
let nextKeyboardButtonBottomConstraint = NSLayoutConstraint(item: self.nextKeyboardButton, attribute: .Bottom, relatedBy: .Equal, toItem: self.view, attribute: .Bottom, multiplier: 1, constant: 0)
NSLayoutConstraint.activateConstraints([nextKeyboardButtonLeftSideConstraint, nextKeyboardButtonBottomConstraint])
}
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(animated)
self.heightConstraint = NSLayoutConstraint(item:self.inputView!, attribute:.Height, relatedBy:.Equal, toItem:nil, attribute:.NotAnAttribute, multiplier:0, constant:0)
self.heightConstraint!.priority = 999
self.heightConstraint!.active = true
}
override func updateViewConstraints() {
super.updateViewConstraints()
guard self.heightConstraint != nil && self.view.frame.size.width != 0 && self.view.frame.size.height != 0 else { return }
let portraitHeight: CGFloat = 400
let landscapeHeight: CGFloat = 200
let screenSize = UIScreen.mainScreen().bounds.size
let newHeight = screenSize.width > screenSize.height ? landscapeHeight : portraitHeight
if (self.heightConstraint!.constant != newHeight) {
self.heightConstraint!.constant = newHeight
}
}
我在iOS 8到iOS 10的自定义键盘上也遇到了类似的问题。我相信正确的解决方案是让输入视图提供一个适当的intrinsicContentSize和改变(和无效!)值，当你想改变视图的高度。示例代码:
class CustomInputView: UIInputView {
var intrinsicHeight: CGFloat = 200 {
didSet {
self.invalidateIntrinsicContentSize()
}
}
init() {
super.init(frame: CGRect(), inputViewStyle: .keyboard)
self.translatesAutoresizingMaskIntoConstraints = false
}
required init?(coder: NSCoder) {
super.init(coder: coder)
self.translatesAutoresizingMaskIntoConstraints = false
}
override var intrinsicContentSize: CGSize {
return CGSize(width: UIViewNoIntrinsicMetric, height: self.intrinsicHeight)
}
}
class ViewController: UIViewController {
@IBOutlet weak var textView: UITextView!
override func viewDidLoad() {
super.viewDidLoad()
textView.becomeFirstResponder()
let inputView = CustomInputView()
// To make the view's size more clear.
inputView.backgroundColor = UIColor(red: 0.5, green: 1, blue: 0.5, alpha: 1)
textView.inputView = inputView
// To demonstrate a change to the view's intrinsic height.
DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + .seconds(2)) {
inputView.intrinsicHeight = 400
}
}
}
其他答案没有考虑冲突约束和设备旋转。这个答案避免了诸如"无法同时满足约束"之类的错误以及由此产生的问题。它部分依赖于在未来版本的iOS中可能改变的行为，但似乎是在iOS 8上解决这个问题的唯一方法。
在UIInputViewController子类中，添加这些方法:
- (void)updateViewConstraints {
[super updateViewConstraints];
// Update height when appearing
[self updateViewHeightConstraintIfNeeded];
}
- (void)viewWillLayoutSubviews {
[super viewWillLayoutSubviews];
// Update height when rotating
[self updateViewHeightConstraintIfNeeded];
}
- (void)updateViewHeightConstraintIfNeeded {
CGFloat preferedHeight = 216; // Portrait
if ( [UIScreen mainScreen].bounds.size.width
> [UIScreen mainScreen].bounds.size.height ) {
// Landscape
preferedHeight = 162;
}
NSLayoutConstraint *constraint = [self findViewHeightConstraint];
if ( preferedHeight != constraint.constant ) {
if ( constraint ) {
constraint.constant = preferedHeight;
} else {
// This is not run on current versions of iOS, but we add it to
// make sure the constraint exits
constraint = [NSLayoutConstraint constraintWithItem:self.view
attribute:NSLayoutAttributeHeight
relatedBy:NSLayoutRelationEqual
toItem:nil
attribute:NSLayoutAttributeNotAnAttribute
multiplier:0
constant:preferedHeight];
[self.view.superview addConstraint:constraint];
}
}
}
- (NSLayoutConstraint*)findViewHeightConstraint {
NSArray *constraints = self.view.superview.constraints;
for ( NSLayoutConstraint *constraint in constraints ) {
if ( constraint.firstItem == self.view
&& constraint.firstAttribute == NSLayoutAttributeHeight )
return constraint;
}
return nil;
}
放入ViewDidAppear:
NSLayoutConstraint *heightConstraint =
[NSLayoutConstraint constraintWithItem: self.view
attribute: NSLayoutAttributeHeight
relatedBy: NSLayoutRelationEqual
toItem: nil
attribute: NSLayoutAttributeNotAnAttribute
multiplier: 0.0
constant: 300];
[self.view addConstraint: heightConstraint];
适用于iOS 8.1
- (void)updateViewConstraints {
[super updateViewConstraints];
// Add custom view sizing constraints here
CGFloat _expandedHeight = 500;
NSLayoutConstraint *_heightConstraint =
[NSLayoutConstraint constraintWithItem: self.view
attribute: NSLayoutAttributeHeight
relatedBy: NSLayoutRelationEqual
toItem: nil
attribute: NSLayoutAttributeNotAnAttribute
multiplier: 0.0
constant: _expandedHeight];
[self.view addConstraint: _heightConstraint];
}
-(void)viewDidAppear:(BOOL)animated
{
[self updateViewConstraints];
}
它为我工作
我创建这个函数工作，对我来说很好。添加prepareHeightConstraint()和heightConstraint，并在updateViewConstraints和viewWillAppear调用prepareHeightConstraint()
private var heightConstraint: NSLayoutConstraint!
/**
Prepare the height Constraint when create or change orientation keyboard
*/
private func prepareHeightConstraint() {
guard self.heightConstraint != nil else {
let dummyView = UILabel(frame:CGRectZero)
dummyView.translatesAutoresizingMaskIntoConstraints = false
self.view.addSubview(dummyView)
self.heightConstraint = NSLayoutConstraint( item:self.view, attribute:.Height, relatedBy:.Equal, toItem:nil, attribute:.NotAnAttribute, multiplier:0.0, constant: /* Here your height */)
// /* Here your height */ Here is when your create your keyboard
self.heightConstraint.priority = 750
self.view.addConstraint(self.heightConstraint!)
return
}
// Update when change orientation etc..
self.heightConstraint.constant = /* Here your height */
}
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(animated)
// When keyboard is create
self.prepareHeightConstraint()
}
override func updateViewConstraints() {
super.updateViewConstraints()
guard let viewKeyboard = self.inputView where viewKeyboard.frame.size.width != 0 && viewKeyboard.frame.size.width != 0 {
return
}
//Update change orientation, update just the constant
self.prepareHeightConstraint()
}
为了更流畅地显示更改方向的动画，我添加了以下内容:
- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator
{
CGFloat width = [UIScreen mainScreen].bounds.size.width;
self.view.window.frame = CGRectMake(0, 0, width, heigth);
}
我也一直在制作键盘并与高度问题作斗争。我尝试了提到的所有解决方案以及应用程序扩展编程指南解决方案，但无法修复它。我的键盘有非常复杂的视图层次。经过一番挣扎，我找到了一个完全适合我的解决方案。这是一种攻击，但我已经测试了所有的情况，即使是旋转设备，它是完美的。我想它会帮助别人，所以我把我的代码在这里。
// Keep this code inside the UIInputViewController
@implementation KeyBoardViewController
@property (strong, nonatomic) NSLayoutConstraint *heightConstraint;
// This method will first get the height constraint created by (Run time system or OS) then deactivate it and add our own custom height constraint.
(void)addHeightConstraint {
for (NSLayoutConstraint* ct in self.view.superview.constraints) {
if (ct.firstAttribute == NSLayoutAttributeHeight) {
[NSLayoutConstraint deactivateConstraints:@[ct]];
}
}
if (!_heightConstraint) {
_heightConstraint = [NSLayoutConstraint constraintWithItem:self.view attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:0.0 constant: 300];
[_heightConstraint setPriority:UILayoutPriorityDefaultHigh];
[self.view addConstraint:_heightConstraint];
}else {
_heightConstraint.constant = 300;
}
if (_heightConstraint && !_heightConstraint.isActive) {
[NSLayoutConstraint activateConstraints:@[_heightConstraint]];
}
[self.view layoutIfNeeded];
}
(void)viewWillLayoutSubviews {
[self addHeightConstraint];
}
这是一个非常古老的问题，但我只是想分享，我发现UIInputViewController实际上根据你添加到它的子视图调整自己的大小。如果你像这样添加一个视图到视图控制器:
let myView: UIView(frame: .zero)
myView.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
myView.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
myView.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
myView.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
其中view是输入视图控制器的视图，然后指定高度约束，输入视图控制器将遵循该高度而不破坏任何约束。
这是完美的，因为您可以添加一个堆栈视图，您可以在其中添加提供固有内容大小的视图。这样就不必指定高度约束，因为堆栈视图会根据添加到它的视图隐式地调整大小。
这是不可能的。从docs
此外，不可能像iPhone上的系统键盘那样，当你点击顶部一行的一个键时，在顶部一行上方显示关键图形。
所以，如果可能的话，我们可以很容易地在第一行上面画一些东西。
编辑:苹果似乎解决了这个问题。请参阅接受的答案
如果接受的答案对任何一个都不起作用，则使用以下方式。所有代码都是一样的，只是改变updateViewConstraints Reference
中的代码- (void)updateViewConstraints {
[super updateViewConstraints];
if (self.view.frame.size.width == 0 || self.view.frame.size.height == 0)
return;
[self.inputView removeConstraint:self.heightConstraint];
CGSize screenSize = [[UIScreen mainScreen] bounds].size;
CGFloat screenH = screenSize.height;
CGFloat screenW = screenSize.width;
BOOL isLandscape = !(self.view.frame.size.width ==
(screenW*(screenW<screenH))+(screenH*(screenW>screenH)));
NSLog(isLandscape ? @"Screen: Landscape" : @"Screen: Potriaint");
if (isLandscape)
{
self.heightConstraint = [NSLayoutConstraint constraintWithItem:self.inputView attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:0.0 constant: self.landscapeHeight];
[self.inputView addConstraint:self.heightConstraint];
} else {
self.heightConstraint = [NSLayoutConstraint constraintWithItem:self.inputView attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:0.0 constant: self.portraitHeight];
[self.inputView addConstraint:self.heightConstraint];
}
}
最后我得到了它，将此代码块添加到您的UIInputViewController子类class:
override func viewDidAppear(animated: Bool) {
let desiredHeight:CGFloat = 300.0 // or anything you want
let heightConstraint = NSLayoutConstraint(item: view, attribute:NSLayoutAttribute.Height,
relatedBy: NSLayoutRelation.Equal,
toItem: nil,
attribute: NSLayoutAttribute.NotAnAttribute,
multiplier: 1.0,
constant: desiredHeight)
view.addConstraint(heightConstraint)
}
它会完美地工作…iOS 8.3
这是我为iOS9和Storyboard所做的。
我使用了@skyline75489的答案并修改了它。
@property (nonatomic) CGFloat portraitHeight;
@property (nonatomic) CGFloat landscapeHeight;
@property (nonatomic) BOOL isLandscape;
@property (nonatomic) NSLayoutConstraint *heightConstraint;
@property (nonatomic) BOOL viewWillAppearExecuted;
- (id)initWithCoder:(NSCoder *)aDecoder {
self = [super initWithCoder:aDecoder];
if (self) {
// Perform custom initialization work here
self.portraitHeight = 256;
self.landscapeHeight = 203;
}
return self;
}
- (void)updateViewConstraints {
[super updateViewConstraints];
if (_viewWillAppearExecuted)
[self adjustHeight];
}
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
[self.view addConstraint:self.heightConstraint];
_viewWillAppearExecuted = YES;
}
#pragma mark - Setters/Getters
- (NSLayoutConstraint *)heightConstraint
{
if (!_heightConstraint) {
_heightConstraint = [NSLayoutConstraint constraintWithItem:self.view attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:0.0 constant:self.portraitHeight];
_heightConstraint.priority = UILayoutPriorityRequired - 1;
}
return _heightConstraint;
}
#pragma mark - Methods
- (void)adjustHeight
{
if (self.view.frame.size.width == 0 || self.view.frame.size.height == 0)
return;
[self.view removeConstraint:self.heightConstraint];
CGSize screenSize = [[UIScreen mainScreen] bounds].size;
CGFloat screenH = screenSize.height;
CGFloat screenW = screenSize.width;
BOOL isLandscape = !(self.view.frame.size.width ==
(screenW*(screenW<screenH))+(screenH*(screenW>screenH)));
self.isLandscape = isLandscape;
if (isLandscape) {
self.heightConstraint.constant = self.landscapeHeight;
[self.view addConstraint:self.heightConstraint];
} else {
self.heightConstraint.constant = self.portraitHeight;
[self.view addConstraint:self.heightConstraint];
}
}
在IOS 10 (swift 4)中，我不得不将上述答案结合起来，原因有三个:
- 当你旋转iPhone时，不调用
-
updateViewConstraints。 - 设置
heightConstraint会产生一个约束，该约束被布局 忽略。 intrinsicContentSize只在我不理解的情况下起作用@objc public class CustomInputView: UIInputView { var intrinsicHeight: CGFloat = 296.0 { didSet { self.invalidateIntrinsicContentSize() } } @objc public init() { super.init(frame: CGRect(), inputViewStyle: .keyboard) self.translatesAutoresizingMaskIntoConstraints = false } @objc public required init?(coder: NSCoder) { super.init(coder: coder) self.translatesAutoresizingMaskIntoConstraints = false } @objc public override var intrinsicContentSize: CGSize { let screenSize = UIScreen.main.bounds.size let newHeight :CGFloat = screenSize.width > screenSize.height ? 230.0 : intrinsicHeight return CGSize(width: UIViewNoIntrinsicMetric, height: newHeight) } } @objc public class KeyboardViewController: UIInputViewController { let portraitHeight:CGFloat = 296.0 let landscapeHeight:CGFloat = 230.0 var heightConstraint: NSLayoutConstraint? func updateHeightConstraint(to size: CGSize){ var heightConstant=portraitHeight if size.width>400 { heightConstant=landscapeHeight } if heightConstant != heightConstraint!.constant { inputView?.removeConstraint(heightConstraint!) heightConstraint!.constant = heightConstant; inputView?.addConstraint(heightConstraint!) } } override public func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) { super.viewWillTransition(to: size, with: coordinator) updateHeightConstraint(to: size) } override public func viewDidAppear(_ animated: Bool) { super.viewDidAppear(animated) updateHeightConstraint(to: UIScreen.main.bounds.size) } override public func viewDidLoad() { super.viewDidLoad() heightConstraint = NSLayoutConstraint(item: self.inputView as Any, attribute: NSLayoutAttribute.height, relatedBy: NSLayoutRelation.equal, toItem: nil, attribute: NSLayoutAttribute.notAnAttribute, multiplier: 1.0, constant: portraitHeight) heightConstraint!.priority = UILayoutPriority(rawValue: 999.0) heightConstraint!.isActive=true; } //... code to insert, delete,.. }
在viewDidAppear中，我必须调用updateHeightConstraint，因为当我更改UIInputViewController
viewWillTransition。我不需要self.nextKeyboardButton.translatesAutoresizingMaskIntoConstraints = false