之前处理过键盘遮挡的问题，整体来看，要想在新的页面里做相同的处理，比较繁琐。
先说一下之前是怎么做的：viewcontroller --> tableview --> tableviewcell --> textview/textfield(视图层次)
处理起来是通过tableviewcell的代理是viewcontroller将textview或textfield的编辑开始结束事件传递给viewcontroller，然后viewcontroller通过响应开始和结束编辑事件并且监听键盘的show和hidden的通知。来移动整个view以避免遮挡。
这样处理的确实现的避免键盘遮挡当前录入内容。不过其他的页面移植这个功能很麻烦。
下面是相关的代码：
#pragma mark -- 处理键盘遮挡 -- TextView或textfield开始编辑
- (void)textFieldBegin:(UIView *)sender {
__weak typeof(self) weakSelf = self;
CGRect rect = [sender convertRect:sender.bounds toView:[[UIApplication sharedApplication] keyWindow]];
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
if (self.view.frame.size.height - rect.origin.y - rect.size.height < self.keyHeight) {
NSLog(@"keybord is keep out inputview");
[UIView animateWithDuration:0.1 animations:^{
weakSelf.view.center = CGPointMake(weakSelf.view.center.x, weakSelf.view.center.y - weakSelf.keyHeight);
self.keyBgView = [[UIView alloc] initWithFrame:CGRectMake(0, [UIScreen mainScreen].bounds.size.height, [UIScreen mainScreen].bounds.size.width, self.keyHeight)];
self.keyBgView.backgroundColor = [UIColor whiteColor];
[weakSelf.view addSubview:self.keyBgView];
self.keyDo = YES;
}];
}
});
}
- (void)keyBordDown {
__weak typeof(self) weakSelf = self;
if (self.keyDo) {
[UIView animateWithDuration:0.1 animations:^{
weakSelf.view.center = CGPointMake(weakSelf.view.center.x, weakSelf.view.center.y + weakSelf.keyHeight);
self.keyBgView = [[UIView alloc] initWithFrame:CGRectMake(0, [UIScreen mainScreen].bounds.size.height, [UIScreen mainScreen].bounds.size.width, self.keyHeight)];
self.keyBgView.backgroundColor = [UIColor whiteColor];
[weakSelf.view addSubview:self.keyBgView];
self.keyDo = NO;
}];
}
}
-(void)KeyboardWillShow:(NSNotification *)notification {
NSDictionary *info = [notification userInfo];
//获取高度
NSValue *value = [info objectForKey:@"UIKeyboardBoundsUserInfoKey"];//关键的一句，网上关于获取键盘高度的解决办法，多到这句就over了。系统宏定义的UIKeyboardBoundsUserInfoKey等测试都不能获取正确的值。不知道为什么。。。
CGSize keyboardSize = [value CGRectValue].size;
// NSLog(@"横屏%f",keyboardSize.height);
float keyboardHeight = keyboardSize.height;
self.keyHeight = keyboardHeight;
NSLog(@"%f",keyboardHeight + 30);
}
- (void)KeyboardWillHidden:(NSNotificationCenter *)notification {
[self keyBordDown];
}
但是，处理键盘遮挡，完全没有必要这样来处理。
监听到键盘的show和hidden的通知，就足处理键盘遮挡的问题。
关键在于在键盘show的时候获取到当前的第一响应者
UIWindow *keyWindow = [[UIApplication sharedApplication] keyWindow];
///第一响应这
UIView *firstResponder = [keyWindow performSelector:@selector(firstResponder)];
如此，即可通过以下代码来做处理，而且方便移植到新的vc
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(KeyboardWillShow:)
name:UIKeyboardWillShowNotification
object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(KeyboardWillHidden:)
name:UIKeyboardWillHideNotification
object:nil];
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
[[[UIApplication sharedApplication] keyWindow] endEditing:YES];
}
#pragma mark -- 处理键盘遮挡
-(void)KeyboardWillShow:(NSNotification *)notification {
UIWindow *keyWindow = [[UIApplication sharedApplication] keyWindow];
UIView *firstResponder = [keyWindow performSelector:@selector(firstResponder)];
CGRect rect = [firstResponder convertRect:firstResponder.frame toView:self.view];//获取相对于self.view的位置
NSDictionary *userInfo = [notification userInfo];
NSValue* aValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];//获取弹出键盘的fame的value值
CGRect keyboardRect = [aValue CGRectValue];
keyboardRect = [self.view convertRect:keyboardRect fromView:self.view.window];//获取键盘相对于self.view的frame ，传window和传nil是一样的
CGFloat keyboardTop = keyboardRect.origin.y;
NSNumber * animationDurationValue = [userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey];//获取键盘弹出动画时间值
NSTimeInterval animationDuration = [animationDurationValue doubleValue];
if (keyboardTop < CGRectGetMaxY(rect)) {//如果键盘盖住了输入框
CGFloat gap = keyboardTop - CGRectGetMaxY(rect) - 10;//计算需要网上移动的偏移量（输入框底部离键盘顶部为10的间距）
__weak typeof(self)weakSelf = self;
[UIView animateWithDuration:animationDuration animations:^{
weakSelf.view.frame = CGRectMake(weakSelf.view.frame.origin.x, gap, weakSelf.view.frame.size.width, weakSelf.view.frame.size.height);
}];
}
}
- (void)KeyboardWillHidden:(NSNotification *)notification {
NSDictionary *userInfo = [notification userInfo];
NSNumber * animationDurationValue = [userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey];//获取键盘隐藏动画时间值
NSTimeInterval animationDuration = [animationDurationValue doubleValue];
if (self.view.frame.origin.y < 0) {//如果有偏移，当影藏键盘的时候就复原
__weak typeof(self)weakSelf = self;
[UIView animateWithDuration:animationDuration animations:^{
weakSelf.view.frame = CGRectMake(weakSelf.view.frame.origin.x, 0, weakSelf.view.frame.size.width, weakSelf.view.frame.size.height);
}];
}
}