我无法在任何地方找到这些信息,所以问这里.
究竟element.layer.shadowOffset = CGSizeMake(2.0, 2.0)]做了什么?
它对元素的偏移量是多少?
当键盘出现在文本字段上时,我有以下代码用于上下移动视图.
-(void)textFieldDidBeginEditing:(UITextField *)textField{
NSLog(@"height before animation%f",self.view.frame.size.height);
NSLog(@"%f",self.view.frame.size.height);
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.3];
[self.view setFrame:CGRectMake(0,-216,320,460)];
[UIView commitAnimations];
}
-(void)textFieldDidEndEditing:(UITextField *)textField{
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.3];
[self.view setFrame:CGRectMake(0,0,320,460)];
[UIView commitAnimations];
NSLog(@"height after animation %f",self.view.frame.size.height);
}
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这是我在键盘出现然后编辑完成时得到的示例日志:
2014-01-21 11:00:51.194 Master-view[456:70b] height before animation 568.000000
2014-01-21 11:00:53.635 Master-view[456:70b] height after animation 460.000000
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视图的高度似乎降低了,这使得屏幕的底部不可互动.为什么会这样?
视图正在向上移动,也没有问题.在视觉上似乎没有区别.在升空之前存在的所有元素都在下降后存在.但是屏幕底部的元素(超过460.0的高度)并不难解决.