popViewControllerAnimated從後退按鈕

Question

我怎樣才能彈出後退按鈕按下，我通過從以前的視圖控制器的下面的代碼。謝謝

self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] 
     initWithTitle:@"Back" 
     style:UIBarButtonItemStyleBordered 
     target:nil action:nil]; 

Answer 1

沒有必要手動添加後退按鈕。

但是，如果您確實需要該自定義按鈕來彈出視圖控制器，則可以創建自定義消息。

-(void)popViewControllerWithAnimation { 
    [self.navigationController popViewControllerAnimated:YES]; 
} 
... 
self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] 
    initWithTitle:@"Back" 
    style:UIBarButtonItemStyleBordered 
    target:self action:@selector(popViewControllerWithAnimation)]; 

或者創建一個NSInvocation。

NSInvocation* invoc = [NSInvocation invocationWithMethodSignature: 
     [self.navigationController methodSignatureForSelector:@selector(popViewControllerAnimated:)]]; 
// watch out for memory management issues: you may need to -retain invoc. 
[invoc setTarget:self.navigationController]; 
[invoc setSelector:@selector(popViewControllerAnimated:)]; 
BOOL yes = YES; 
[invoc setArgument:&yes atIndex:2]; 
self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] 
    initWithTitle:@"Back" 
    style:UIBarButtonItemStyleBordered 
    target:invoc action:@selector(invoke)];