我们有一个带有 UIPickerView 和工具栏 (216 + 44) 的自定义视图。在初始化时 (viewDidLoad),使用以下代码将此自定义视图推送到屏幕下方。
CGPoint newOrigin;
newOrigin.x = pickerViewOutlet.frame.size.width/2;
newOrigin.y = self.view.frame.size.height + ((pickerViewOutlet.frame.size.height)/2);
NSLog(@"%f,%f",self.view.frame.size.height,(pickerViewOutlet.frame.size.height)/2);
pickerViewOutlet.center = CGPointMake(newOrigin.x, newOrigin.y);
单击按钮时,将使用以下代码段拉出此视图。
[self.view bringSubviewToFront:pickerViewOutlet];
NSLog(@"tabbar %f",self.tabBarController.tabBar.frame.size.height);
CGPoint showOrigin;
showOrigin.x = pickerViewOutlet.frame.size.width/2;
showOrigin.y = pickerViewOutlet.center.y - pickerViewOutlet.frame.size.height;
//self.tabBarController.tabBar.frame.size.height ;
NSLog(@"showpicker %f,%f",pickerViewOutlet.center.y,pickerViewOutlet.frame.size.height);
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDuration:0.5];
pickerViewOutlet.center=CGPointMake(showOrigin.x, showOrigin.y);
[UIView commitAnimations];
[pickerCtrlOutlet reloadAllComponents];
这很好用。然而,当页面上存在底部选项卡栏控制器时,这不起作用(视图的一部分位于选项卡栏下方),即使代码被修改为
showOrigin.y = pickerViewOutlet.center.y - pickerViewOutlet.frame.size.height - self.tabBarController.tabBar.frame.size.height ;
但是如果上面的代码修改为
showOrigin.y = pickerViewOutlet.center.y - pickerViewOutlet.frame.size.height - self.tabBarController.tabBar.frame.size.height - 90;
它在视图位于选项卡栏正上方的情况下完美运行。