如何使iOS中的UialerTview更大

Question

我在iOS应用中显示免责声明的uialertView，但是iOS中的默认AlertView大小很小。我该如何使其更大？

看来应该简单的东西，但是从我搜索的哪些信息来看似乎不是一种方法？

代码，

UIAlertView* alert = [[UIAlertView alloc] initWithTitle: @"Disclaimer" message: nil delegate: self cancelButtonTitle: @"Accept" otherButtonTitles: nil];
UIWebView* webView = [[UIWebView alloc] init];
[webView setFrame:CGRectMake(0, 0, 280, 140)];
[webView loadHTMLString: html baseURL: nil];
UIView* view = [[UIView alloc] initWithFrame: CGRectMake(0, 0, 280, 140)];
[view addSubview: webView];
[alert setValue: view forKey: @"accessoryView"];
[alert show];

Answer 1

首先，使用您的Web视图创建一个视图控制器，我们称其为MyWebViewController。

然后，您可以将其作为全屏控制器展示：

MyWebViewController* alertController = [[MyWebViewController alloc] init];
alertController.view.backgroundColor = [UIColor.lightGrayColor colorWithAlphaComponent:0.2];
alertController.modalPresentationStyle = UIModalPresentationOverFullScreen;
[self presentViewController:alertController animated:YES completion:nil];

这是一个全屏控制器。您将必须在中心为内容创建一个视图，为该视图添加一个边框，并将所有内容保持在半透明的范围内。

您也可以使用弹出窗口：

UIView *sourceView = self.view;
MyWebViewController* alertController = [[MyWebViewController alloc] init];
alertController.modalPresentationStyle = UIModalPresentationPopover;
alertController.preferredContentSize = CGRectInset(self.view.bounds, 20, 100).size;
alertController.popoverPresentationController.canOverlapSourceViewRect = YES;
alertController.popoverPresentationController.sourceView = sourceView;
alertController.popoverPresentationController.sourceRect = CGRectMake(CGRectGetMidX(sourceView.bounds), CGRectGetMidY(sourceView.bounds), 0, 0);
alertController.popoverPresentationController.permittedArrowDirections = 0;
alertController.popoverPresentationController.delegate = self;
[self presentViewController:alertController animated:YES completion:nil];

代表还必须实施：

- (UIModalPresentationStyle)adaptivePresentationStyleForPresentationController:(UIPresentationController *)controller traitCollection:(UITraitCollection *)traitCollection {
    return UIModalPresentationNone;
}

源视图通常是打开弹出窗口的按钮，但我正在使用父视图来确保弹出窗口的中心。

您还必须添加UIAlertView自动添加的按钮，但这应该是微不足道的。

Answer 2

您需要创建一个新类来完成此操作：

WebAlertView.h

#import <UIKit/UIKit.h>
@interface WebAlertView : UIView
- (id)initWithTitle:(NSString *)title webView:(UIWebView *)webView delegate:(id)delegate cancelButtonTitle:(NSString *)cancelButtonTitle;
- (void)show;
@end
@protocol WebAlertViewDelegate <NSObject>
@optional
- (void)webAlertViewCancel:(WebAlertView *)alertView;
@end

webalertview.m

#import "WebAlertView.h"
@interface WebAlertView()
@property (weak, nonatomic) UIWebView *webView;
@property (weak, nonatomic) NSString *title;
@property (weak, nonatomic) NSString *cancelButtonTitle;
@property (weak, nonatomic) id delegate;
@property (strong, nonatomic) UIView *curtainView;
@end
@implementation WebAlertView
- (id)initWithTitle:(NSString *)title webView:(UIWebView *)webView delegate:(id)delegate cancelButtonTitle:(NSString *)cancelButtonTitle {
    CGFloat titleViewHeight = 64.0;
    CGFloat cancelButtonHeight = 44.0;
    if ((self = [super initWithFrame:CGRectMake(0, 0, webView.frame.size.width, webView.frame.size.height+titleViewHeight+cancelButtonHeight)])) {
        self.backgroundColor = [UIColor groupTableViewBackgroundColor];
        _webView = webView;
        _title = title;
        _cancelButtonTitle = cancelButtonTitle;
        _delegate = delegate;
        CGRect titleViewFrame = self.frame;
        titleViewFrame.size.height = titleViewHeight;
        UILabel *label = [[UILabel alloc] initWithFrame:titleViewFrame];
        label.text = title;
        label.font = [UIFont boldSystemFontOfSize:16.0];
        label.textAlignment = NSTextAlignmentCenter;
        [self addSubview:label];
        CGRect webViewFrame = _webView.frame;
        webViewFrame.origin.y = titleViewHeight;
        _webView.frame = webViewFrame;
        [self addSubview:_webView];
        CGRect cancelButtonFrame = self.frame;
        cancelButtonFrame.size.height = cancelButtonHeight;
        cancelButtonFrame.origin.y = self.frame.size.height - cancelButtonHeight;
        UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];
        button.frame = cancelButtonFrame;
        [button setTitle:cancelButtonTitle forState:UIControlStateNormal];
        button.titleLabel.font = [UIFont boldSystemFontOfSize:16.0];
        [button addTarget:self action:@selector(buttonTouchUpInside) forControlEvents:UIControlEventTouchUpInside];
        [self addSubview:button];
    }
    return self;
}
- (void)show {
    if ([_delegate isKindOfClass:[UIViewController class]]) {
        UIViewController *delegateViewController = (UIViewController *)_delegate;
        if (!_curtainView) {
            _curtainView = [[UIView alloc] initWithFrame:delegateViewController.view.bounds];
            _curtainView.backgroundColor = [UIColor blackColor];
            _curtainView.alpha = 0.5;
        }
        [delegateViewController.view addSubview:_curtainView];
        self.center = delegateViewController.view.center;
        [delegateViewController.view addSubview:self];
    }
}
- (void)drawRect:(CGRect)rect {
    self.layer.cornerRadius = 16.0;
    self.clipsToBounds = YES;
}
- (void)buttonTouchUpInside {
    [_curtainView removeFromSuperview];
    [self removeFromSuperview];
    if([_delegate respondsToSelector:@selector(webAlertViewCancel:)]) {
        [_delegate webAlertViewCancel:self];
    }
}
@end

如何使用：

UIWebView* webView = [[UIWebView alloc] init];
[webView setFrame:CGRectMake(0, 0, 280, 140)];
NSURLRequest *urlRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:@"https://www.google.com"]];
[webView loadRequest:urlRequest];
WebAlertView *webAlertView = [[WebAlertView alloc] initWithTitle:@"Disclaimer" webView:webView delegate:self cancelButtonTitle:@"Accept"];
[webAlertView show];

注意：

• 仅实现取消按钮 - 如果需要的话，应该给您一个想法。
• 没有什么可以阻止您使WebAlertView大于其超级视图，因此请记住这一点。标题的长度或取消按钮字符串也没有考虑。
• 正如其他人所提到的，UialertView被弃用。
• 如果您想使用ViewController，Sulthan给出了一个很好的答案。如果您真的想要像Uialertview这样有效的东西。

Answer 3

根据Apple文档，UialerTview类旨在用作IS，并且不支持子分类。此类的视图层次结构是私人的，不得修改。

要自定义大小，请使用JSSALERTVIEW而不是UialertView

Answer 4

uialertView在iOS 9.0中弃用。您需要开始使用UialertController。据我所知，我们可以增加uialertController的大小。我已经尝试了所有的方式。

Answer 5

您必须通过自己的第三方创建自定义视图：因为在UIAlertView和UIAlertController框架调整不起作用。

Answer 6

使用 nslayoutconstraint ，并制作固定的 uialertController 高度和宽度。

以下是代码：

UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"abcd" message:@"edfg" preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *action = [UIAlertAction actionWithTitle:@"Done" style:UIAlertActionStyleDefault handler:nil];
[alert addAction:action];
NSLayoutConstraint *height = [NSLayoutConstraint constraintWithItem:alert.view attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1 constant:self.view.frame.size.height * 0.8];
NSLayoutConstraint *width = [NSLayoutConstraint constraintWithItem:alert.view attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeWidth  multiplier:1 constant:self.view.frame.size.width * 0.5];
[alert.view addConstraint:width];
[alert.view addConstraint:height];
[alert.view setBackgroundColor:[UIColor blackColor]];
[self presentViewController:alert animated:YES completion:nil];

但是 uialertController 的宽度已修复。使用 nslayoutconstraint uialertController的宽度未更改。

Answer 7

您不应该这样做，但是有hack可以扩展整个uialertView。uialertView始终显示在新窗口中，诀窍是扩展窗口。

[alert show]
alert.window.transform = CGAffineTransformScale(CGAffineTransformIdentity, 1.3, 1.3); // Must be called after [alert show]