一、以前使用的退出键盘方法
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。
- (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];
}
一般都使用这个方法，但是这样写是有问题的，在使用系统手写键盘时会出现奔溃问题。
手写键盘输入时，会调用UIScrollView的- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event;这个分类方法，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,所以系统会奔溃。
二、增加判断避免手写输入奔溃
- (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];
}
}
}
这个方法UIscrollview没有问题，但是在UItableview上的取消键盘会失效
三、点击手势退出键盘
使用点击手势可以避免问题
UITapGestureRecognizer *tapView = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(touchViewCancelKeyBoard:)];
tapView.cancelsTouchesInView = NO;
[self.view addGestureRecognizer:tapView];
- (void)touchViewCancelKeyBoard:(UITapGestureRecognizer *)tap {
[self.TextField resignFirstResponder];
}
四、scrollview自带的属性
scsrollView.keyboardDismissMode = UIScrollViewKeyboardDismissModeOnDrag;
其中keyboardDismissMode是UIScrollView的属性,
它的值除了UIScrollViewKeyboardDismissModeNone,
UIScrollViewKeyboardDismissModeOnDrag，表示拖动时键盘消失，
UIScrollViewKeyboardDismissModeInteractive，表示键盘可以随着手指下滑而移出屏幕。
希望这个内容对大家有用
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