在iOS开发中，UITextFiled和UITextView是很常见的两个控件，当我们设置好这两个控件后，点击文字输入区域，系统会自动弹出键盘，但是如何收起键盘、点击哪里收起键盘，以及在iPhone4中键盘弹出后遮挡输入框怎么办呢？
这篇文章将带领大家解决：
1》点击其他空白区域收起键盘
2》点击键盘右下角的键收起键盘
3》处理键盘遮挡问题
一，点击其他空白区域收起键盘
- (void)viewDidLoad {
[super viewDidLoad];
[self setUpForDismissKeyboard];
}
#pragma mark - 回收任何空白区域键盘事件
- (void)setUpForDismissKeyboard {
NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
UITapGestureRecognizer *singleTapGR =
[[UITapGestureRecognizer alloc] initWithTarget:self
action:@selector(tapAnywhereToDismissKeyboard:)];
NSOperationQueue *mainQuene =[NSOperationQueue mainQueue];
[nc addObserverForName:UIKeyboardWillShowNotification
object:nil
queue:mainQuene
usingBlock:^(NSNotification *note){
[self.view addGestureRecognizer:singleTapGR];
}];
[nc addObserverForName:UIKeyboardWillHideNotification
object:nil
queue:mainQuene
usingBlock:^(NSNotification *note){
[self.view removeGestureRecognizer:singleTapGR];
}];
}
- (void)tapAnywhereToDismissKeyboard:(UIGestureRecognizer *)gestureRecognizer {
//此method会将self.view里所有的subview的first responder都resign掉
[self.view endEditing:YES];
}
二，点击键盘右下角的键收起键盘
#pragma mark - TextView 代理方法
-(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
if ([text isEqualToString:@"\n"]) {
[self.workLogTextView resignFirstResponder];
return NO;
}
return YES;
}
注意：需要遵守textView/textFiled的代理。改代码是textView代理方法，若实际用到的是textFiled，只需调用textFiled的该类方法即可。
三，处理键盘遮挡问题
#pragma mark 键盘遮挡
- (BOOL)textViewShouldBeginEditing:(UITextView *)textView {
if (self.userInfo.isPhone4) {
CGFloat offset_y = 0.f;
if (textView.tag == CALL_CONTENT_TEXTFIRLD) {
offset_y = 100.f;
}
CGPoint point = self.BackScrollView.contentOffset;
point = CGPointMake(point.x, offset_y);
[UIView animateWithDuration:0.25 animations:^{
self.BackScrollView.contentOffset = point;
}];
}
return YES;
}
- (BOOL)textViewShouldEndEditing:(UITextView *)textView{
if (self.userInfo.isPhone4) {
CGFloat offset_y = 0.f;
if (textView.tag == CALL_CONTENT_TEXTFIRLD) {
offset_y = 100.f;
}
CGPoint point = self.BackScrollView.contentOffset;
point = CGPointMake(point.x, 0);
[UIView animateWithDuration:0.25 animations:^{
self.BackScrollView.contentOffset = point;
}];
}
return YES;
}
注意：需要遵守 UIScrollViewDelegate 和 textView/textFiled的代理。需要该页面的父视图是UIScrollView，才能保证弹出键盘时页面向上移动，收起键盘时页面向下移动。代码中的self.BackScrollView就是对应的父视图，使用时请替换掉。
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