在iOS 8中呈现隐藏键盘时编辑UIView的边界

概述我提出了一个小的“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 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)

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