iOS 手写输入法奔溃，一种方法是常见的新建一个view监听点击手势，隐藏键盘，然后这个view最后加入到self.view要整屏宽高，
{ UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(keyboardHide:)];
//设置成NO表示当前控件响应后会传播到其他控件上，默认为YES。
tapGestureRecognizer.cancelsTouchesInView = NO;
//将触摸事件添加到当前view
[self.view addGestureRecognizer:tapGestureRecognizer];
}
- (void)keyboardHide:(UITapGestureRecognizer *)sender
{
[self.view endEditing:YES];
}
另外一种就是，判断一下是否是uiscrollview，看了网上一个帖子觉得挺好 //www.greatytc.com/p/0e9cb4a8c3a0
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];
}
}
}
作者：vincent涵
链接：//www.greatytc.com/p/0e9cb4a8c3a0
來源：简书
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