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touchesBegan: withEvent: <--- with UIScrollView / UIImageView

时间:2016-08-11 00:23:54      阅读:178      评论:0      收藏:0      [点我收藏+]

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touchesBegan: withEvent: / touchesMoved: withEvent: / touchesEnded: withEvent: 等只能被UIView捕获(如有问题请指出对请指出,路过的大牛请勿喷),当我们创建

UIScrollView 或 UIImageView 时,当点击时UIScrollView 或 UIImageView 会截获touch事件,导致touchesBegan: withEvent:/touchesMoved: withEvent:/touchesEnded: withEvent: 等方法不执行。解决办法:当UIScrollView 或 UIImageView 截获touch事件后,让其传递下去即可(就是传递给其父视图UIView)

解决方法一: 

可以通过写UIScrollView 或 UIImageView 的category 重写touchesBegan: withEvent: / touchesMoved: withEvent: / touchesEnded: withEvent: 等来实现

 

解决方法二: 覆盖一个全屏View

并在- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{} 做相关处理

 

 

 

[objc] view plain copy
 
  1. //  
  2. //  UIScrollView+UITouch.m  
  3. //    
  4. //  
  5. //  Created by MLS on 15/11/20.  
  6. //  Copyright © 2015年 mls. All rights reserved.  
  7. //  
  8.   
  9. #import "UIScrollView+UITouch.h"  
  10.   
  11. @implementation UIScrollView (UITouch)  
  12.   
  13. - (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event  
  14. {  
  15.     // 选其一即可  
  16.     [super touchesBegan:touches withEvent:event];  
  17. //    [[self nextResponder] touchesBegan:touches withEvent:event];  
  18. }  
  19.   
  20. @end  

解决方法三:

UIScrollView 上如果有UITextField的话,结束编辑(退出键盘)直接用touchesBegan方法无效,需要再给UIScrollView加一个分类,重写几个方法。
网上已经有很多前辈给了相关代码是这样的(阅前提示:这样是有问题的!):

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    [[self nextResponder] touchesBegan:touches withEvent:event];
    [super touchesBegan:touches withEvent:event];

}
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
    [[self nextResponder] touchesMoved:touches withEvent:event];
    [super touchesMoved:touches withEvent:event];
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    [[self nextResponder] touchesEnded:touches withEvent:event];
    [super touchesEnded:touches withEvent:event];
}

这样会有一个严重问题,就是使用手写输入法输入中文会导致崩溃(虽然使用手写输入法的人不多,但也不能无视他们)。被坑死,问题是百度出来尼玛80~90%全是这种解决方法。坑死人!

有一些前辈对于“UIScrollView点击空白处退出键盘”就提出了另一种解决方法:加一层view,给view一个点击事件,退出键盘。

但是我的项目中已经被前一种方法坑了,已经有用户反映手写崩溃,换第二种方法的话很麻烦,需要修改之后重新提交审核,不能及时解决,我需要及时的用JSPatch线上打补丁解决。调试了很久,我发现手写键盘在调用UIScrollView的这个分类的方法时,self的类型是UIKBCandidateCollectionView,一种系统没有暴露出来的类型,应该是UIScrollView的一个子类,所以解决办法就呼之欲出了,直接上代码。

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    if (![self isMemberOfClass:[UIScrollView class]]) {

    } else {
        [[self nextResponder] touchesBegan:touches withEvent:event];
        if ([super respondsToSelector:@selector(touchesBegan:withEvent:)]) {
            [super touchesBegan:touches withEvent:event];
        }
    }

}
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
    if (![self isMemberOfClass:[UIScrollView class]]) {

    } else {
        [[self nextResponder] touchesMoved:touches withEvent:event];
        if ([super respondsToSelector:@selector(touchesBegan:withEvent:)]) {
            [super touchesMoved:touches withEvent:event];
        }
    }

}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    if (![self isMemberOfClass:[UIScrollView class]]) {

    } else {
        [[self nextResponder] touchesEnded:touches withEvent:event];
        if ([super respondsToSelector:@selector(touchesBegan:withEvent:)]) {
            [super touchesEnded:touches withEvent:event];
        }
    }
}

手写输入法崩溃完美解决O(∩_∩)O~~



 

参考链接:

1.http://blog.csdn.net/maolianshuai/article/details/49949751

2.http://www.jianshu.com/p/0e9cb4a8c3a0

3.http://www.jianshu.com/p/0e9cb4a8c3a0

touchesBegan: withEvent: <--- with UIScrollView / UIImageView

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原文地址:http://www.cnblogs.com/Jenaral/p/5759150.html

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