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iOS 導航欄自帶頁面右滑pop使用示例

更新時間：2017年12月08日 11:21:12 作者：LYPC_下里巴人

本篇文章主要介紹了iOS 導航欄自帶頁面右滑pop使用示例，小編覺得挺不錯的，現(xiàn)在分享給大家，也給大家做個參考。一起跟隨小編過來看看吧

iOS7之后蘋果導航控制器增加了一個左側(cè)邊緣右滑pop的手勢，在非棧底的控制器里面，從左邊右滑之后相當于出棧（pop）樣子。

以下設(shè)置均在自定義的UINavigationController里操作

// 默認是YES 設(shè)置為NO左側(cè)右滑手勢就不可用了
self.interactivePopGestureRecognizer.enabled = YES;

也可以通過手勢實現(xiàn)右滑

遵守UIGestureRecognizerDelegate協(xié)議，設(shè)置代理對象，實現(xiàn)一下代理方法即可：

-(void)viewDidAppear:(BOOL)animated {
  [super viewDidAppear:animated];
  self.navigationController.interactivePopGestureRecognizer.delegate = self;
}
#pragma mark - UIGestureRecognizerDelegate
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer
{
  if (self.viewControllers.count <= 1) {
    return NO;
  }
  return YES;
}

個人的記憶方法：

backBarButtonItem設(shè)置下一個頁面的返回按鈕

leftBarButtonItem設(shè)置當前頁面的返回按鈕

項目中我們多數(shù)會自定義左側(cè)返回按鈕leftBarButtonItem，這個時候就算設(shè)置self.interactivePopGestureRecognizer.enabled = YES了或者實現(xiàn)手勢的代理，左邊緣的右滑動手勢依舊會失效，例如如下代碼寫過之后，可以驗證一下，失效了。

- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
{
  if (self.viewControllers.count > 0) {
    /* 不是棧底控制器的時候隱藏tabbar */
    viewController.hidesBottomBarWhenPushed = YES;
    // 設(shè)置左邊的返回按鈕leftBarButtonItem
    UIButton *backBtn = [UIButton buttonWithType:UIButtonTypeCustom];
    backBtn.frame = CGRectMake(0, 0, 44, 44);
    backBtn.imageView.contentMode = UIViewContentModeCenter;
    backBtn.contentEdgeInsets = UIEdgeInsetsMake(0, 0, 0, 34);
    [backBtn setImage:[UIImage imageNamed:@"rrrr"] forState:UIControlStateNormal];
    [backBtn setImage:[UIImage imageNamed:@"rrrr"] forState:UIControlStateHighlighted];
    [backBtn addTarget: self action: @selector(back) forControlEvents: UIControlEventTouchUpInside];
    UIBarButtonItem *backBtnItem=[[UIBarButtonItem alloc]initWithCustomView:backBtn];
    viewController.navigationItem.leftBarButtonItem = backBtnItem;
// 此處改為設(shè)置backBarButtonItem 右滑手勢可以用，但自定義按鈕不展示??！
  }
  [super pushViewController:viewController animated:animated];
}

按照如下方式設(shè)置backBarButtonItem或leftBarButtonItem，其他不做任何設(shè)置，右滑效果可用：

- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
{
  if (self.viewControllers.count > 0) {
    /* 不是棧底控制器的時候隱藏tabbar */
    viewController.hidesBottomBarWhenPushed = YES;
  }
  [self.navigationBar setBackIndicatorImage:[UIImage imageNamed:@"rrrr"]];
  [self.navigationBar setBackIndicatorTransitionMaskImage:[UIImage imageNamed:@"rrrr"]];
  UIBarButtonItem *backItem = [[UIBarButtonItem alloc] initWithTitle:@"" style:UIBarButtonItemStylePlain target:nil action:nil];
  self.navigationItem.backBarButtonItem = backItem;
  [super pushViewController:viewController animated:animated];
}

或者

- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
{
  if (self.viewControllers.count > 0) {
    /* 不是棧底控制器的時候隱藏tabbar */
    viewController.hidesBottomBarWhenPushed = YES;
    [self.navigationBar setBackIndicatorImage:[UIImage imageNamed:@"rrrr"]];
    [self.navigationBar setBackIndicatorTransitionMaskImage:[UIImage imageNamed:@"rrrr"]];
    UIBarButtonItem *backItem = [[UIBarButtonItem alloc] initWithTitle:@"" style:UIBarButtonItemStylePlain target:nil action:nil];
    self.navigationItem.leftBarButtonItem = backItem;
  }
  [super pushViewController:viewController animated:animated];
}

進過上面的反復測試：在自定義導航欄控制器中backBarButtonItem不能用View視圖方法自定義，而leftBarButtonItem可以。

setBackIndicatorImage和setBackIndicatorTransitionMaskImage無論怎么設(shè)置都是只能看到setBackIndicatorImage的圖片，找不到原因?。?！

然后嘗試直接在root視圖控制器里面設(shè)置返回按鈕backBarButtonItem的自定義view,右滑手勢可用，但是設(shè)置leftBarButtonItem就不能使用右滑手勢：

- (void)viewDidLoad {
  [super viewDidLoad];
  // 設(shè)置左邊的返回按鈕
  UIButton *backBtn = [UIButton buttonWithType:UIButtonTypeCustom];
  backBtn.frame = CGRectMake(0, 0, 44, 44);
  backBtn.imageView.contentMode = UIViewContentModeCenter;
  backBtn.contentEdgeInsets = UIEdgeInsetsMake(0, 0, 0, 34);
  [backBtn setImage:[UIImage imageNamed:@"rrrr"] forState:UIControlStateNormal];
  [backBtn setImage:[UIImage imageNamed:@"rrrr"] forState:UIControlStateHighlighted];
  [backBtn addTarget: self action: @selector(back) forControlEvents: UIControlEventTouchUpInside];
  backBtn.backgroundColor = [UIColor redColor];
  
  [self.navigationController.navigationBar setBackIndicatorImage:[UIImage imageNamed:@"rrrr"]];
  [self.navigationController.navigationBar setBackIndicatorTransitionMaskImage:[UIImage imageNamed:@"rrrr"]];
  UIBarButtonItem *backBtnItem=[[UIBarButtonItem alloc]initWithCustomView:backBtn];
  backBtnItem.title = @"";
  self.navigationItem.backBarButtonItem = backBtnItem;
  }

以上是自己的驗證，希望對大家的學習有所幫助，也希望大家多多支持腳本之家。

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