iPhone/iPad的添加添加和删除子视图不工作

Question

林有添加到我的场景一个新的观点麻烦少量的，我有这样的代码：

- (void) showMyDayView { 
NSLog(@"My Day View was touched"); 

MyDayViewController *temp = [[MyDayViewController alloc] initWithNibName: @"MyDayView" bundle:nil]; 
self.myDayViewController = temp; 

NSLog(@"superview: %@", [[self mainNavView] superview]); 
[[self mainNavView] removeFromSuperview]; 
NSLog(@"after removal main: %@", [self mainNavView]); 
NSLog(@"after removal view: %@", [self view]); 
NSLog(@"after removal superview: %@", [[self view] superview]); 

[[[self view] superview] addSubview: [self.myDayViewController view]]; 

[temp release]; 
} 

当我运行此代码，控制台说：“删除后超视图：（空）”

所以当我添加到superview的子视图，没有任何反应，因为superview是空的。

任何想法？

感谢 马克

Answer 1

如果你想重用你要removeFromSuperview一个视图，你必须先保留。 removeFromSuperview释放它被调用的任何视图。

所以......

[[self mainNavView] retain] 
[[self mainNavView] removeFromSuperview]; 

而[自mainNavView]仍然可以放心使用。