的UITextField的边界Flash的

我在一个滚动视图，有几个UITextField并通过设定每一次我得到了集中的任何文本框或取消键盘时的UITextField的边界Flash的

layer.borderColor = ..., 
layer.borderRadius = 3.0, 
layer.borderWidth = 0.1, 
layer.masksToBounds = YES. 

- (void)keyboardWillShow:(NSNotification *)notification { 
CGFloat animDuration = [notification.userInfo[UIKeyboardAnimationDurationUserInfoKey] floatValue]; 

CGRect rect = [self.currentTextField superview].frame; 

[UIView animateWithDuration:animDuration animations:^{ 
    [self.scrollView scrollRectToVisible:rect animated:NO]; 
}]; 
} 

- (void)keyboardWillHide:(NSNotification *)notification { 
CGFloat animDuration = [notification.userInfo[UIKeyboardAnimationDurationUserInfoKey] floatValue]; 
CGRect rect = [self.currentTextField superview].frame; 
[UIView animateWithDuration:animDuration animations:^{   
    [self.scrollView scrollRectToVisible:rect animated:NO]; 
}]; 
}

的Bug，该文本框的所有边境闪烁我的自定义文本框的边界。但如果我只是滚动scrollView不闪烁

来源

2016-07-05 super shen

为什么你需要使用'[UIView的animateWithDuration：animDuration动画： [se lf.scrollView scrollRectToVisible：rect animated：NO]; }];'，为什么不使用'[self.scrollView scrollRectToVisible：rect animated：NO];'直接 – childrenOurFuture

@childrenOurFuture是正确的，尝试在没有UiView动画的情况下滚动，但是动画：YES – DoN1cK

首先当键盘显示或隐藏，我需要使用键盘动画持续时间相应地滚动scrollView。 –

我终于找到了决议。使用CoreAnimation rasteraztion，切换TextField的层的shouldRasterize为true：textField.layer.shouldRasterize =真并设置规模：textField.layer.rasterizationScale = UIScreen.mainScreen（）规模 shouldRasterize指示CoreAnimatin缓存层内容作为一个图像。你然后摆脱闪烁。为避免任何不必要的缓存，应在动画完成后立即关闭光栅化。

整个代码如下：

- (void)keyboardWillShow:(NSNotification *)notification { 
CGRect keyboardRectEnd = [notification.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue]; 
CGFloat animDuration = [notification.userInfo[UIKeyboardAnimationDurationUserInfoKey] floatValue]; 

CGRect rect = [self.currentTextField superview].frame; 
self.scrollViewBottomConstraint.constant = keyboardRectEnd.size.height; 

[self toggleTextFieldRasterization:YES]; 
[UIView animateWithDuration:animDuration animations:^{ 
    [self.scrollView scrollRectToVisible:rect animated:NO]; 
    [self layoutIfNeeded]; 
} completion: ^(BOOL finished) { 
    [self toggleTextFieldRasterization:NO]; 
}];

}

- (void)keyboardWillHide:(NSNotification *)notification { 
CGFloat animDuration = [notification.userInfo[UIKeyboardAnimationDurationUserInfoKey] floatValue]; 
CGRect rect = [self.currentTextField superview].frame; 
self.scrollViewBottomConstraint.constant = 0.0; 

[self toggleTextFieldRasterization:YES]; 
[UIView animateWithDuration:animDuration animations:^{ 
    [self.scrollView scrollRectToVisible:rect animated:NO]; 
    [self layoutIfNeeded]; 
} completion:^(BOOL finished) { 
    [self toggleTextFieldRasterization:NO]; 
}];

}

- (void)toggleTextFieldRasterization:(BOOL)toggle { 
CGFloat scale = UIScreen.mainScreen.scale; 
self.textField1.layer.shouldRasterize = toggle; 
self.textField1.layer.rasterizationScale = scale; 
self.textField2.layer.shouldRasterize = toggle; 
self.textField2.layer.rasterizationScale = scale; 
self.textField3.layer.shouldRasterize = toggle; 
self.textField3.layer.rasterizationScale = scale;

}

来源

2016-07-07 07:35:05

的UITextField的边界Flash的

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