在第一个状态下,应用程序具有UITextField,相机UIButton和取消UIButton之后未显示的相机按钮,因为它已被定位在应用程序的限制范围之外.实际上我的应用程序有320的宽度和取消按钮来源是(350,7)
在第二状态,当用户触摸UITextField时,相机按钮alpha通道设置为0,取消按钮的原点设置为(247,7).
用户触摸键盘的返回按钮或取消按钮后,最终状态与第一状态相同.
在处理期间,UITextField宽度和x轴上的取消按钮原点是动画的.
我的代码是：
- (void)textFieldDidBeginEditing:(UITextField *)textField
{
barcodeSearchButton.userInteractionEnabled = NO;
cancelButton.userInteractionEnabled = NO;
CGFloat cancelButtonXOffset = CGRectGetMaxX(barcodeSearchButton.frame) - cancelButton.frame.size.width;
CGFloat searchFieldWidth = searchField.frame.size.width - cancelButton.frame.size.width + barcodeSearchButton.frame.size.width;
[UIView animateWithDuration:0.3
animations:^{
searchField.frame = CGRectMake(searchField.frame.origin.x,searchField.frame.origin.y,searchFieldWidth,searchField.frame.size.height);
cancelButton.alpha = 1.0;
cancelButton.frame = CGRectMake(cancelButtonXOffset,cancelButton.frame.origin.y,cancelButton.frame.size.width,cancelButton.frame.size.height);
barcodeSearchButton.alpha = 0.0;
}
completion:^(BOOL finished) {
barcodeSearchButton.userInteractionEnabled = NO;
cancelButton.userInteractionEnabled = YES;
}];
}
- (void)textFieldDidEndEditing:(UITextField *)textField
{
barcodeSearchButton.userInteractionEnabled = NO;
cancelButton.userInteractionEnabled = NO;
[UIView animateWithDuration:0.3
animations:^{
searchField.frame = CGRectMake(searchField.frame.origin.x,searchFieldStartWidth,searchField.frame.size.height);
cancelButton.alpha = 0.0;
cancelButton.frame = CGRectMake(cancelButtonStartX,cancelButton.frame.size.height);
barcodeSearchButton.alpha = 1.0;
}
completion:^(BOOL finished) {
barcodeSearchButton.userInteractionEnabled = YES;
cancelButton.userInteractionEnabled = NO;
}];
}
当动画第一次执行到最终状态时,这意味着,用户触摸了UITextField,WROTE DOWN(这部分很重要)场上的一些文本,然后用户触摸键盘返回按钮就会出现问题.问题是,当UITextField的宽度也被动画化时,UITextField中的键入文本也会被动画化.
动画表现得像波纹管：
> UITextField延伸回其初始值.
>取消按钮返回其初始原点
>相机按钮设置为1.0
>键入的文本从UITextField的左上角飞过,它进入UITextfield到它不应该离开的位置.
问题是第4步不应该发生,问题是它只发生一次.如果再次启动该过程(触摸uitextfield,键入一些文本,触摸返回键),则步骤4不会发生.
我花了一天时间试图解决这个问题,但我没有成功.
解决方法
我的第一次尝试是覆盖textFieldDidBeginEditing和textFieldDidEndEditing来创建动画.我不知道动画在textFieldShouldBeginEditing和textFieldShouldEndEditing中工作的原因,但在textFieldDidBeginEditing和textFieldDidEndEditing中没有.但它只是有效.
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField {
CGFloat cancelButtonXOffset = CGRectGetMaxX(barcodeSearchButton.frame) - cancelButton.frame.size.width;
CGFloat searchFieldWidth = searchField.frame.size.width - cancelButton.frame.size.width + barcodeSearchButton.frame.size.width;
[UIView animateWithDuration:0.3
animations:^{
searchField.frame = CGRectMake(searchField.frame.origin.x,cancelButton.frame.size.height);
barcodeSearchButton.alpha = 0.0;
} completion:^(BOOL finished) {
searchField.clearButtonMode = UITextFieldviewmodeAlways;
}];
return YES;
}
- (BOOL)textFieldShouldEndEditing:(UITextField *)textField {
[UIView animateWithDuration:0.3
animations:^{
searchField.frame = CGRectMake(searchField.frame.origin.x,searchField.frame.size.height);
cancelButton.alpha = 0.0;
cancelButton.frame = CGRectMake(cancelButtonStartX,cancelButton.frame.size.height);
barcodeSearchButton.alpha = 1.0;
} completion:^(BOOL finished) {
searchField.clearButtonMode = UITextFieldviewmodeNever;
}];
return YES;
}