iOS8:不显示 UIPopoverController 但 iOS7 可以
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【中文标题】iOS8:不显示 UIPopoverController 但 iOS7 可以【英文标题】:iOS8: Not show UIPopoverController but iOS7 is OK 【发布时间】:2015-01-21 07:40:59 【问题描述】:Apple似乎从ios8开始改变了对UIPopoverController的态度。
请看下面的代码。我想在 addSubview 之后显示 UIPopoverController。 iOS6和iOS7没问题,但在iOS8上不显示。
您能提出任何可能的原因吗?任何帮助将不胜感激。
- (IBAction)tapButton:(id)sender
SampleView *sampleView = [[SampleView alloc] initWithFrame:CGRectMake(0.0f, 0.0f,
[UIScreen mainScreen].bounds.size.width,
[UIScreen mainScreen].bounds.size.height)];
sampleView.backgroundColor = [UIColor blueColor];
sampleView.alpha = 0.5;
sampleView.label = [[UILabel alloc] initWithFrame:CGRectMake([UIScreen mainScreen].bounds.size.width / 2,
[UIScreen mainScreen].bounds.size.height / 2,
200.0f, 20.0f)];
sampleView.label.text = @"SAMPLE TEXT";
sampleView.label.textColor = [UIColor redColor];
[sampleView addSubview:sampleView.label];
[self.view.window addSubview:sampleView];
if (!self.popover)
UIViewController *vc = [[UIViewController alloc] init];
vc.view.backgroundColor = [UIColor redColor];
vc.preferredContentSize = CGSizeMake(200, 300);
self.popover = [[UIPopoverController alloc] initWithContentViewController:vc];
// On iOS7 is OK but not show on iOS8
[self.popover presentPopoverFromRect:CGRectMake(200, 100, 0, 0)
inView:sampleView.label
permittedArrowDirections:UIPopoverArrowDirectionUp
animated:YES];
更新1:
我跟着这个问题的答案。
in iOS8: UIPopoverController presentPopoverFromRect not work for keyWindow any more
这是更新的代码。
[self.popover presentPopoverFromRect:CGRectMake(200, 100, 0, 0)
inView:self.view
permittedArrowDirections:UIPopoverArrowDirectionUp
animated:YES];
据我检查,keyWindos 和 self.view.window 似乎是一样的。
NSLog(@"%@", [UIApplication sharedApplication].keyWindow);
NSLog(@"%@", self.view.window);
但是,对于我的情况,这不是完整的解决方案。我想控制添加的子视图的视图。
更新2:
我想我需要在 iOS8 上使用 UIPopoverPresentationController。
- (IBAction)tapButton:(id)sender
// View
SampleView *sampleView = [[SampleView alloc] initWithFrame:CGRectMake(0.0f, 0.0f,
[UIScreen mainScreen].bounds.size.width,
[UIScreen mainScreen].bounds.size.height)];
sampleView.backgroundColor = [UIColor blueColor];
sampleView.alpha = 0.5;
// Label
sampleView.label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 200.0f, 20.0f)];
sampleView.label.text = @"SAMPLE TEXT";
sampleView.label.textColor = [UIColor redColor];
[sampleView addSubview:sampleView.label];
// View Controller
UIViewController *viewController = [[UIViewController alloc] init];
viewController.modalPresentationStyle = UIModalPresentationPopover;
viewController.view = sampleView;
// UIPopoverPresentationController
UIPopoverPresentationController *presentationController = viewController.popoverPresentationController;
[presentationController setDelegate:self];
presentationController.permittedArrowDirections = 0;
presentationController.sourceView = [[UIApplication sharedApplication] keyWindow];
presentationController.sourceRect = [[UIApplication sharedApplication] keyWindow].bounds;
[viewController setPreferredContentSize:CGSizeMake(320, 480)];
[self presentViewController:viewController animated:YES completion:nil];
if (!self.popover)
UIViewController *vc = [[UIViewController alloc] init];
vc.view.backgroundColor = [UIColor redColor];
vc.preferredContentSize = CGSizeMake(200, 300);
vc.modalPresentationStyle = UIModalPresentationPopover;
self.popover = [[UIPopoverController alloc] initWithContentViewController:vc];
self.popover.delegate = self;
[self.popover presentPopoverFromRect:CGRectMake(300, 300, 0, 0)
inView:viewController.view
permittedArrowDirections:UIPopoverArrowDirectionUp
animated:YES];
Update3 我使用了 dispatch_async 但没用。有人说 dispatch_async 在这种情况下是有效的。 dispatch_async 是非常简单的解决方案。我更喜欢使用它。如果您可以使用 dispatch_async 解决我的问题,我将不胜感激您能附上代码。
- (IBAction)tapButton:(id)sender
SampleView *sampleView = [[SampleView alloc] initWithFrame:CGRectMake(0.0f, 0.0f,
[UIScreen mainScreen].bounds.size.width,
[UIScreen mainScreen].bounds.size.height)];
sampleView.backgroundColor = [UIColor blueColor];
sampleView.alpha = 0.5;
sampleView.label = [[UILabel alloc] initWithFrame:CGRectMake([UIScreen mainScreen].bounds.size.width / 2,
[UIScreen mainScreen].bounds.size.height / 2,
200.0f, 20.0f)];
sampleView.label.text = @"SAMPLE TEXT";
sampleView.label.textColor = [UIColor redColor];
[sampleView addSubview:sampleView.label];
[self.view.window addSubview:sampleView];
if (!self.popover)
UIViewController *vc = [[UIViewController alloc] init];
vc.view.backgroundColor = [UIColor redColor];
vc.preferredContentSize = CGSizeMake(200, 300);
self.popover = [[UIPopoverController alloc] initWithContentViewController:vc];
// I tried this but not worked.
dispatch_async(dispatch_get_main_queue(), ^
[self.popover presentPopoverFromRect:CGRectMake(200, 100, 0, 0)
inView:sampleView.label
permittedArrowDirections:UIPopoverArrowDirectionUp animated:YES];
);
【问题讨论】:
【参考方案1】:为 iOS 8 尝试并执行以下操作
dispatch_async(dispatch_get_main_queue(), ^ [self.popover presentPopoverFromRect:CGRectMake(200, 100, 0, 0) inView:sampleView.label allowedArrowDirections:UIPopoverArrowDirectionUp 动画:YES]; );编辑
这是我的代码,不管有没有 dispatch_async 都可以。
self.popover = [[UIPopoverController alloc] initWithContentViewController:[self.storyboard instantiateViewControllerWithIdentifier:@"second"]]; dispatch_async(dispatch_get_main_queue(), ^ [self.popover presentPopoverFromRect:self.button.frame inView:self.button allowedArrowDirections:UIPopoverArrowDirectionUp 动画:YES]; );【讨论】:
谢谢。我试过但没有奏效。请参阅我的问题的 Update3。有人说 dispatch_async 有效,但对我来说不起作用。以上是关于iOS8:不显示 UIPopoverController 但 iOS7 可以的主要内容,如果未能解决你的问题,请参考以下文章