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iOS 防键盘遮挡的实例

2023-09-17 22:21:05 78

当我们在UITextField输入数据时经常弹出键盘遮挡界面，解决方法是：在弹出键盘时将整个UIVIew向上移动，在键盘消失时，UIVIew还原。

实例代码如下：

@interfaceViewController()
@property(nonatomic,strong)UITextField*tf;
@end
@implementationViewController
-(void)viewDidLoad{
[superviewDidLoad];
self.tf=[[UITextFieldalloc]initWithFrame:CGRectMake(10,600,100,20)];
self.tf.delegate=self;
self.tf.backgroundColor=[UIColorblackColor];
[self.viewaddSubview:self.tf];

}
#pragmamarklifeCircle
-(void)viewWillAppear:(BOOL)animated{
[superviewWillAppear:animated];

//后台切换到前台通知
[[NSNotificationCenterdefaultCenter]addObserver:selfselector:@selector(applicationWillEnterForeground)name:UIApplicationWillEnterForegroundNotificationobject:nil];
[[NSNotificationCenterdefaultCenter]addObserver:self
selector:@selector(keyboardWillHide:)
name:UIKeyboardWillHideNotification
object:nil];

[self.viewendEditing:YES];
}
-(void)applicationWillEnterForeground{
[self.viewendEditing:YES];
}
-(void)touchesEnded:(NSSet*)toucheswithEvent:(UIEvent*)event{
[self.viewendEditing:YES];
}

#pragmamarkUITextFieldDelegate
-(void)textFieldDidBeginEditing:(UITextField*)textField{

//第一个cell不往上弹输入框的位置
//if(indexPath.row!=0){
[[NSNotificationCenterdefaultCenter]addObserver:selfselector:@selector(keyboardWillChange:)name:UIKeyboardWillChangeFrameNotificationobject:nil];
//}
}

-(void)textFieldDidEndEditing:(UITextField*)textField{
}
#pragmamark键盘操作
-(void)keyboardWillChange:(NSNotification*)note
{
NSDictionary*userInfo=note.userInfo;
CGFloatduration=[userInfo[@"UIKeyboardAnimationDurationUserInfoKey"]doubleValue];
CGRectkeyFrame=[userInfo[@"UIKeyboardFrameEndUserInfoKey"]CGRectValue];
//这个64是我减去的navigationbar加上状态栏20的高度,可以看自己的实际情况决定是否减去;
CGFloatmoveY=keyFrame.origin.y-self.tf.frame.origin.y-self.tf.frame.size.height;
NSLog(@"%f",moveY);
[UIViewanimateWithDuration:durationanimations:^{
self.view.transform=CGAffineTransformMakeTranslation(0,moveY);
}];
}

-(void)keyboardWillHide:(NSNotification*)nsnotification
{
[[NSNotificationCenterdefaultCenter]removeObserver:selfname:UIKeyboardWillChangeFrameNotificationobject:nil];
[UIViewanimateWithDuration:0.2animations:^{
self.view.transform=CGAffineTransformMakeTranslation(0,0);
}];
}

@end

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iOS 防键盘遮挡的实例

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