在iOS 8中呈现隐藏键盘时编辑UIView的边界

我提出了一个小的“登录” UIViewController作为具有自定义边界的UIModalPresentationFormSheet 。 在viewWillLayoutSubviews方法中，我将视图的大小更改为（300,250）。 这在iOS 5/6/7中有效，但在8中不再有效。

当呈现视图并且点击UITextField ，应用程序变得无响应（未冻结，只是没有响应触摸）。 几乎就像键盘出现但没有出现。 委托方法被正确调用。 如果我删除self.view.superview.bounds = CGRectMake(0, 0, 300, 250); 从viewWillLayoutSubviews方法键盘工作，但视图现在是一个完整大小的UIModalPresentationFormSheet样式。

这只发生在iOS 8中，所以我只能假设键盘显示的方式以及我屏蔽/调整视图的方式存在问题，但我对解决方案感到茫然。

呈现ViewController –

 UserLoginViewController *loginVC = [[UserLoginViewController alloc] initWithNibName:@"UserLoginViewController" bundle:nil]; loginVC.modalPresentationStyle = UIModalPresentationFormSheet; loginVC.delegate = self; [self presentViewController:loginVC animated:YES completion:nil]; 

编辑视图边界 –

 - (void)viewWillLayoutSubviews { [super viewWillLayoutSubviews]; self.view.superview.layer.cornerRadius = 10.0; self.view.superview.layer.masksToBounds = YES; self.view.superview.bounds = CGRectMake(0, 0, 300, 250); } 

Answer 1

在iOS8中，您不应更改viewWillLayoutSubviews中的超视图边界，因为它会导致无限循环。

编辑：在iOS8属性preferredContentSize运行良好。

您应该以这种方式更改代码：

  UserLoginViewController *loginVC = [[UserLoginViewController alloc] initWithNibName:@"UserLoginViewController" bundle:nil]; loginVC.modalPresentationStyle = UIModalPresentationFormSheet; loginVC.delegate = self; if(IS_IOS8) { loginVC.preferredContentSize = CGSizeMake(300, 250); } [self presentViewController:loginVC animated:YES completion:nil]; 

编辑视图边界 –

  - (void)viewWillLayoutSubviews{ [super viewWillLayoutSubviews]; self.view.superview.layer.cornerRadius = 10.0; self.view.superview.layer.masksToBounds = YES; if(!IS_IOS8) { self.view.superview.bounds = CGRectMake(0, 0, 300, 250); } } 

另一种为您提供更多自定义选项的方法是使用UIPresentationController和UIViewControllerTransitioningDelegate。 看看下面的代码。

父视图控制器：

  _aboutViewController = [[AboutViewController alloc] init]; _aboutViewController.modalPresentationStyle = UIModalPresentationFormSheet; if(IS_IOS8) { if(aboutTransitioningDelegate == nil) { aboutTransitioningDelegate = [[AboutTransitioningDelegate alloc] init]; } _aboutViewController.transitioningDelegate = aboutTransitioningDelegate; _aboutViewController.modalPresentationStyle = UIModalPresentationCustom; } [self presentViewController:_aboutViewController animated:YES completion:nil]; 

AboutViewController.m

 #import "AboutViewController.h" @interface AboutViewController () @end @implementation AboutViewController - (void)viewWillLayoutSubviews{ [super viewWillLayoutSubviews]; if(IS_IOS8) { return; } CGSize displaySize = CGSizeMake(320, 462); self.view.superview.bounds = CGRectMake(0, 0, displaySize.width, displaySize.height); } @end 

AboutTransitioningDelegate.h：

 @interface AboutTransitioningDelegate : NSObject  @end 

AboutTransitioningDelegate.m：

 #import "AboutTransitioningDelegate.h" #import "AboutPresentationController.h" @implementation AboutTransitioningDelegate -(UIPresentationController *)presentationControllerForPresentedViewController:(UIViewController *)presented presentingViewController:(UIViewController *)presenting sourceViewController:(UIViewController *)source { return [[AboutPresentationController alloc] initWithPresentedViewController:presented presentingViewController:presenting]; } @end 

AboutPresentationController.h

 #import  @interface AboutPresentationController : UIPresentationController @end 

AboutPresentationController.m

 #import "AboutPresentationController.h" @implementation AboutPresentationController -(CGRect)frameOfPresentedViewInContainerView { CGSize displaySize = CGSizeMake(320, 462); if([[Config sharedInstance] latestVersionFromAppstoreInstalled]) { displaySize = CGSizeMake(320, 416); } CGRect r = CGRectZero; r.size = displaySize; r.origin.y = self.containerView.bounds.size.height/2 - displaySize.height/2; r.origin.x = self.containerView.bounds.size.width/2 - displaySize.width/2; return r; } -(void)containerViewWillLayoutSubviews { [super containerViewWillLayoutSubviews]; self.presentedView.frame = [self frameOfPresentedViewInContainerView]; } @end 

项目名 – Prefix.pch

 #define IS_IOS8 ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8) 

Answer 2

调用containerViewWillLayoutSubviews()的最简单方法是调用：

 containerView?.setNeedsLayout()