iPhone/iPad的添加添加和刪除子視圖不工作

Question

林有添加到我的場景一個新的觀點麻煩少量的，我有這樣的代碼：

- (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]; 
} 

當我運行此代碼，控制檯說：「刪除後超視圖：（空）」

所以當我添加到superview的子視圖，沒有任何反應，因爲superview是空的。

任何想法？

感謝 馬克

Answer 1

如果你想重用你要removeFromSuperview一個視圖，你必須先保留。 removeFromSuperview釋放它被調用的任何視圖。

所以......

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

而[自mainNavView]仍然可以放心使用。