当你开发图标或者任何有输入区域的界面,偶尔输入框再键盘弹出时会被挡住。这样用户体验不好,用户在输入时看不到他们所输入的东西。一个解决方案,是滑动整个view让编辑区域一直是可见的。
我提供的整个解决方案对UIView添加了一些方法(我知道,添加类别到cocoa的类是顽皮的)这将决定基于整个屏幕的输入位置滑动视图的多少,还有和键盘弹起一样的速度滑动视图。在编辑完成时滑动回到原来的位置。
做到这样很简单,这是我如何通过计算来滚动视图:
- (void) maintainVisibityOfControl:(UIControl *)control offset:(float)offset { static const float deviceHeight = 480; static const float keyboardHeight = 216; static const float gap = 5; //gap between the top of keyboard and the control //Find the controls absolute position in the 320*480 window - it could be nested in other views CGPoint absolute = [control.superview convertPoint:control.frame.origin toView:nil]; //If it would be hidden behind the keyboard.... if (absolute.y > (keyboardHeight + gap)) { //Shift the view float shiftBy = (deviceHeight - absolute.y) - (deviceHeight - keyboardHeight - gap - offset); [UIView beginAnimations:nil context:nil]; [UIView setAnimationDuration:0.3f]; //this is speed of keyboard CGAffineTransform slideTransform = CGAffineTransformMakeTranslation(0.0, shiftBy); self.transform = slideTransform; [UIView commitAnimations]; } }
..然后我重置了视图通过使用:
- (void) resetViewToIdentityTransform { [UIView beginAnimations:nil context:nil]; [UIView setAnimationDuration:0.3f]; //this is speed of keyboard CGAffineTransform slideTransform = CGAffineTransformIdentity; self.transform = slideTransform; [UIView commitAnimations]; }
你只需要对你的代码做一些小的改动,并在UITextFieldDelegate调用这些方法(或其他控制代理):
- (void) textFieldDidBeginEditing:(UITextField *)textField { [self.view maintainVisibityOfControl:textField offset:0.0f]; } - (void)textFieldDidEndEditing:(UITextField *)textField { if (textField == currentControl) { //If the textfield is still the same one, we can reset the view animated [self.view resetViewToIdentityTransform]; }else { //However, if the currentControl has changed - that indicates the user has //gone into another control - so don't reset view, otherwise animations jump around } }
这里是工程拷贝(见附件)。
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