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时,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(0,300,250);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(0,250);
}
解决方法
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(0,250);
}
}
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,displaySize.width,displaySize.height);
}
@end
AboutTransitioningDelegate.h：
@interface AboutTransitioningDelegate : NSObject <UIViewControllerTransitioningDelegate> @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 <UIKit/UIKit.h> @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)
