在導(dǎo)航控制器中設(shè)置后退按鈕的動(dòng)作我試圖覆蓋導(dǎo)航控制器中Back按鈕的默認(rèn)操作。我在自定義按鈕上提供了一個(gè)目標(biāo)動(dòng)作。奇怪的是，當(dāng)分配它時(shí)，盡管是回退按鈕屬性，它沒(méi)有注意到它們，它只是彈出當(dāng)前的視圖并返回到根：UIBarButtonItem *backButton = [[UIBarButtonItem alloc]
initWithTitle: @"Servers"
style:UIBarButtonItemStylePlain
target:self
action:@selector(home)];self.navigationItem.backBarButtonItem = backButton;一旦我讓它通過(guò)leftBarButtonItem在navigationItem它調(diào)用我的動(dòng)作，然而，這個(gè)按鈕看起來(lái)像一個(gè)普通的圓形按鈕，而不是一個(gè)箭后的按鈕：self.navigationItem.leftBarButtonItem = backButton;在返回根視圖之前，如何讓它調(diào)用我的自定義操作？是否有一種覆蓋默認(rèn)回退操作的方法，還是在離開(kāi)視圖時(shí)總是被調(diào)用的方法(viewDidUnload不是這樣的)？
3 回答
aluckdog
TA貢獻(xiàn)1847條經(jīng)驗(yàn) 獲得超7個(gè)贊
-(void) viewWillDisappear:(BOOL)animated {
if ([self.navigationController.viewControllers indexOfObject:self]==NSNotFound) {
// back button was pressed. We know this is true because self is no longer
// in the navigation stack.
}
[super viewWillDisappear:animated];}
繁花不似錦
TA貢獻(xiàn)1851條經(jīng)驗(yàn) 獲得超4個(gè)贊
navigationShouldPopOnBackButtonUIViewController
-(BOOL) navigationShouldPopOnBackButton {
if(needsShowConfirmation) {
// Show confirmation alert
// ...
return NO; // Ignore 'Back' button this time
}
return YES; // Process 'Back' button click and Pop view controler}- 3 回答
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