iOS自定義返回按鈕保留系統(tǒng)滑動返回功能

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

@interface ViewController ()  
@end@implementation ViewController 
- (void)viewDidLoad { 
    [super viewDidLoad];    // 自定義返回按鈕 
    UIButton *button = [[UIButton alloc]initWithFrame:CGRectMake(0, 0, 44, 44)]; 
    [button setTitle:@"王儼2" forState:UIControlStateNormal]; 
    [button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal]; 
    [button addTarget:self action:@selector(back:) forControlEvents:UIControlEventTouchUpInside];    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc]initWithCustomView:button]; 
} 
- (void)back:(UIButton *)button { 
    [self.navigationController popViewControllerAnimated:YES]; 
} 
- (void)viewWillAppear:(BOOL)animated { 
  [super viewWillAppear:animated];  if (self.navigationController.viewControllers.count > 1) {     // 記錄系統(tǒng)返回手勢的代理 
    _delegate = self.navigationController.interactivePopGestureRecognizer.delegate;     // 設置系統(tǒng)返回手勢的代理為當前控制器 
    self.navigationController.interactivePopGestureRecognizer.delegate = self; 
  } 
} 
- (void)viewWillDisappear:(BOOL)animated { 
  [super viewWillDisappear:animated];   // 設置系統(tǒng)返回手勢的代理為我們剛進入控制器的時候記錄的系統(tǒng)的返回手勢代理 
  self.navigationController.interactivePopGestureRecognizer.delegate = _delegate; 
}#pragma mark - UIGestureRecognizerDelegate- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer {    return self.navigationController.childViewControllers.count > 1; 
} 
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {  return self.navigationController.viewControllers.count > 1; 
}@end