popViewControllerAnimated从后退按钮

Question

我怎样才能弹出后退按钮按下，我通过从以前的视图控制器的下面的代码。谢谢

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

Answer 1

没有必要手动添加后退按钮。

但是，如果您确实需要该自定义按钮来弹出视图控制器，则可以创建自定义消息。

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

或者创建一个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)];