我有一个父视图控制器，它是UIWindow的rootViewController。这个UIViewController有两个子视图(viewcontrollers added)当我点击右侧子视图控制器的按钮时它会打开一个模态视图。当我试图这样做，使用[self presentModalView:vc]从右侧视图它崩溃了整个UI。因此，我改变了代码，即我通过AppDelegate从parentViewController呈现模态视图。因为appdelegate有parentView的实例。当我喜欢这个模态视图时，没有任何问题。
我的问题是，这是正确的方法吗?是否有关于呈现模态视图，该做和不该做的明确的程序/文档?我面临的另一个问题是，当我试图呈现另一个模态视图在这个第一个模态视图它不工作。
请澄清我。
Edited:添加代码示例来模拟问题。RootViewController被添加到窗口。RightViewController是根视图控制器的子视图。当我点击右视图控制器上的按钮时它会将模态视图控制器呈现为模态视图。问题来了。模态视图没有出现正常。我希望这对你有所帮助。
——提前感谢。@durai
#import <UIKit/UIKit.h>
@class RightViewController;
@interface RootViewController : UIViewController {
UIView *bgView;
RightViewController *rightView;
}
@end
#import "RootViewController.h"
#import "RightViewController.h"
@implementation RootViewController
/*
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
*/
- (void) loadView
{
bgView = [[UIView alloc] initWithFrame:[UIApplication sharedApplication].statusBarFrame];
rightView = [[RightViewController alloc] init];
[bgView addSubview:rightView.view];
self.view = bgView;
}
- (void)dealloc
{
[super dealloc];
}
- (void)didReceiveMemoryWarning
{
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
#pragma mark - View lifecycle
/*
// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView
{
}
*/
/*
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
[super viewDidLoad];
}
*/
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return YES;
}
@end
// RightViewController.h
// ModalViewTester
//
//
#import <UIKit/UIKit.h>
#import "ModalViewController.h"
@interface RightViewController : UIViewController <ModalViewDelegate>{
UIView *rightView;
UIButton *button;
}
- (void) showModalView;
@end
#import "RightViewController.h"
@implementation RightViewController
/*
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
*/
- (void) loadView
{
rightView = [[UIView alloc] initWithFrame:CGRectMake(320, 40, 250, 250)];
rightView.backgroundColor = [UIColor yellowColor];
self.view = rightView;
button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
button.frame = CGRectMake(20, 20, 100, 30);
[button setTitle:@"Modal" forState:UIControlStateNormal];
[button addTarget:self action:@selector(showModalView) forControlEvents:UIControlEventTouchUpInside];
[rightView addSubview:button];
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(40, 50, 100, 50)];
label.text = @"Right View";
label.textColor = [UIColor blackColor];
label.font = [UIFont fontWithName:@"Helvetica-Bold" size:14.0f];
[rightView addSubview:label];
self.view = rightView;
}
- (void) showModalView
{
ModalViewController *mc = [[ModalViewController alloc] init];
self.modalPresentationStyle = UIModalPresentationFullScreen;
self.modalTransitionStyle = UIModalTransitionStylePartialCurl;
[self presentModalViewController:mc animated:YES];
[mc release];
}
- (void) closeView:(NSDictionary *)dict
{
[self dismissModalViewControllerAnimated:YES];
}
- (void)dealloc
{
[super dealloc];
}
- (void)didReceiveMemoryWarning
{
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
#pragma mark - View lifecycle
/*
// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView
{
}
*/
/*
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
[super viewDidLoad];
}
*/
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return YES;
}
@end
#import <UIKit/UIKit.h>
@protocol ModalViewDelegate
-(void) closeView:(NSDictionary *) dict;
@end
@interface ModalViewController : UIViewController {
UIView *modalView;
UIButton *cancelButton;
id <ModalViewDelegate> delegate;
}
- (void) closeView:(id) sender;
@end
#import "ModalViewController.h"
@implementation ModalViewController
/*
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
*/
- (void) loadView
{
NSLog(@"Inside ModalViewController - loadView method");
modalView = [[UIView alloc] initWithFrame:[UIApplication sharedApplication].statusBarFrame];
modalView.backgroundColor = [UIColor blueColor];
cancelButton = [[UIButton alloc] initWithFrame:CGRectMake(150, 50, 70, 40)];
[cancelButton setTitle:@"Cancel" forState:UIControlStateNormal];
[cancelButton addTarget:self action:@selector(closeView:) forControlEvents:UIControlEventTouchUpInside];
[modalView addSubview:cancelButton];
self.view = modalView;
}
- (void) closeView:(id) sender
{
[delegate closeView:nil];
}
- (void)dealloc
{
[super dealloc];
}
- (void)didReceiveMemoryWarning
{
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
#pragma mark - View lifecycle
/*
// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView
{
}
*/
/*
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
[super viewDidLoad];
}
*/
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return YES;
}
@end
如果没有任何代码，很难真正掌握您的问题，但如果它是您正在寻找的文档，我认为这是您需要查看的:
http://developer.apple.com/library/ios/featuredarticles/ViewControllerPGforiPhoneOS/modalviewcontroller/ModalViewControllers.html