Question

我目前正在编写iOS应用并遇到一些动画问题。以下是显示我的问题的测试代码。这只是一个非常简单的动画，当键盘显示时，textField会向上移动，当键盘隐藏时，它会向下移动。有趣的是，如果它是一个英文键盘，似乎UIView动画与键盘动画有某种冲突，没有动画执行，但如果我切换到中文键盘，它工作正常。我只想确认它是否是来自苹果的错误....

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    UITextField *textField = [[UITextField alloc] init];
    self.textField = textField;
    textField.placeholder = @"Click me!!";
    textField.frame = CGRectMake(100, 350, 150, 40);
    [self.view addSubview:self.textField];
    self.textField.delegate = self;
}
-(BOOL)textFieldShouldBeginEditing:(UITextField *)textField
{
    [UIView animateWithDuration:0.25 animations:^{
        CGRect frame = self.textField.frame;
        frame.origin.y -= 100;
        self.textField.frame = frame;
    }];
    return YES;
}
-(BOOL)textFieldShouldReturn:(UITextField *)textField
{
    [self.textField resignFirstResponder];
    [UIView animateWithDuration:0.25 animations:^{
        CGRect frame = self.textField.frame;
        frame.origin.y += 100;
        self.textField.frame = frame;
    }];
    return YES;
}

更新

它似乎是来自苹果的一个错误...我尝试使用iOS 8.3模拟器，它工作得非常流畅...在iOS 9.3中，如果你只是尝试显示和隐藏键盘，即使没有移动textField ，动画会在几次操作后卡住......

Answer 1

我建议您将动画块移动到通知UIKeyboardWill{Show|Hide}Notification中的方法。文本字段中的委托方法询问文本字段及其行为 - 与键盘本身无关（甚至可以synchronize持续时间，曲线和延迟）。

您向-textFieldShouldReturn:返回YES，该- (void)viewDidLoad { [super viewDidLoad]; [self setupNotifications]; [self initUIElements]; } - (void)initUIElements { CGRect frame = CGRectMake(0.f, 20.f, 200.f, 44.f); self.textField = [[UITextField alloc] initWithFrame:frame]; self.textField.center = CGPointMake(self.view.center.x, 32.f); self.textField.placeholder = @"Placeholder"; self.textField.delegate = self; [self.view addSubview:self.textField]; self.imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 50.f, 50.f)]; self.imageView.center = self.view.center; self.imageView.backgroundColor = [UIColor magentaColor]; [self.view addSubview:self.imageView]; } - (void)setupNotifications { [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil]; } - (void)keyboardWillHide:(id)sender { [UIView animateWithDuration:1.f animations:^{ self.textField.center = CGPointMake(self.view.center.x, 32.f); self.imageView.center = self.view.center; }]; } - (void)keyboardWillShow:(id)sender { [UIView animateWithDuration:1.f animations:^{ self.textField.center = CGPointMake(self.view.center.x, 62.f); self.imageView.center = CGPointMake(self.view.center.x, (self.view.center.y - 50.f)); }]; } - (BOOL)textFieldShouldReturn:(UITextField *)textField { [textField resignFirstResponder]; return YES; }只应检查文本字段是否应处理返回键。

根据我对动画的体验，有时在使用真实设备进行测试时一切正常。我在这里进行了建议的更改，一切都在iPhone 5c（iOS 8.1）和iPhone 6s Plus（iOS 10，Beta 1）上运行良好。

以下是它的样子：

def state
  if story.school_state_territory.blank?
    ""
  else
    " | #{ story.school_state_territory }"
  end
end

Answer 2

@lin fu

的.m

    - (void)viewDidLoad {
    [super viewDidLoad];

    UITextField *textField = [[UITextField alloc] init];
    textField.placeholder = @"Click me!!";
    textField.delegate = self;
    textField.frame = CGRectMake(100, 350, 150, 40);
    [self.view addSubview:textField];


}
-(BOOL)textFieldShouldBeginEditing:(UITextField *)textField
{
    [UIView animateWithDuration:0.25 animations:^{
        CGRect frame = textField.frame;
        frame.origin.y -= 100;
        textField.frame = frame;
    }];
    return YES;
}
-(BOOL)textFieldShouldReturn:(UITextField *)textField
{
    [textField resignFirstResponder];
    [UIView animateWithDuration:0.25 animations:^{
        CGRect frame = textField.frame;
        frame.origin.y += 100;
        textField.frame = frame;
    }];
    return YES;
}

in .h

试一试。它对我有用。

Answer 3

您还有另一种选择，您可以使用第三方库调用TPAvoidingKeyBoard它会帮助您在那里

iOS键盘动画冲突

3 个答案: