#import "ViewController.h"
@interface ViewController ()
@property(nonatomic ,strong) UITextField * firstResponderTextF;//记录将要编辑的输入框
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
//监听键盘展示和隐藏的通知
[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
}
- (void)dealloc{
//移除键盘通知监听者
[[NSNotificationCenter defaultCenter]removeObserver:self name:UIKeyboardWillShowNotification object:nil];
[[NSNotificationCenter defaultCenter]removeObserver:self name:UIKeyboardWillHideNotification object:nil];
}
-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
if ([self.firstResponderTextF isFirstResponder])[self.firstResponderTextF resignFirstResponder];
}
#pragma maek UITextFieldDelegate
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField{
self.firstResponderTextF = textField;//当将要开始编辑的时候,获取当前的textField
return YES;
}
- (BOOL)textFieldShouldReturn:(UITextField *)textField{
[textField resignFirstResponder];
return YES;
}
#pragma mark : UIKeyboardWillShowNotification/UIKeyboardWillHideNotification
- (void)keyboardWillShow:(NSNotification *)notification{
CGRect rect = [self.firstResponderTextF.superview convertRect:self.firstResponderTextF.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)keyboardWillHide:(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);
}];
}
}
@end
键盘遮挡
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