touchesBegan: withEvent: <--- with UIScrollView / UIImageView
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
- //
- // UIScrollView+UITouch.m
- //
- //
- // Created by MLS on 15/11/20.
- // Copyright © 2015年 mls. All rights reserved.
- //
- #import "UIScrollView+UITouch.h"
- @implementation UIScrollView (UITouch)
- - (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
- {
- // 选其一即可
- [super touchesBegan:touches withEvent:event];
- // [[self nextResponder] touchesBegan:touches withEvent:event];
- }
- @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
