iOS 导航栏自带页面右滑pop使用示例

ios7之后苹果导航控制器增加了一个左侧边缘右滑pop的手势，在非栈底的控制器里面，从左边右滑之后相当于出栈（pop）样子。

以下设置均在自定义的uinavigationcontroller里操作

// 默认是yes 设置为no左侧右滑手势就不可用了
self.interactivepopgesturerecognizer.enabled = yes;

也可以通过手势实现右滑

遵守uigesturerecognizerdelegate协议，设置代理对象，实现一下代理方法即可：

-(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;
}

个人的记忆方法：

backbarbuttonitem设置下一个页面的返回按钮

leftbarbuttonitem设置当前页面的返回按钮

项目中我们多数会自定义左侧返回按钮leftbarbuttonitem，这个时候就算设置self.interactivepopgesturerecognizer.enabled = yes了或者实现手势的代理，左边缘的右滑动手势依旧会失效，例如如下代码写过之后，可以验证一下，失效了。

- (void)pushviewcontroller:(uiviewcontroller *)viewcontroller animated:(bool)animated
{
  if (self.viewcontrollers.count > 0) {
    /* 不是栈底控制器的时候隐藏tabbar */
    viewcontroller.hidesbottombarwhenpushed = yes;
    // 设置左边的返回按钮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;
// 此处改为设置backbarbuttonitem 右滑手势可以用，但自定义按钮不展示！！
  }
  [super pushviewcontroller:viewcontroller animated:animated];
}

按照如下方式设置backbarbuttonitem或leftbarbuttonitem，其他不做任何设置，右滑效果可用：

- (void)pushviewcontroller:(uiviewcontroller *)viewcontroller animated:(bool)animated
{
  if (self.viewcontrollers.count > 0) {
    /* 不是栈底控制器的时候隐藏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) {
    /* 不是栈底控制器的时候隐藏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];
}

进过上面的反复测试：在自定义导航栏控制器中backbarbuttonitem不能用view视图方法自定义，而leftbarbuttonitem可以。

setbackindicatorimage和setbackindicatortransitionmaskimage无论怎么设置都是只能看到setbackindicatorimage的图片，找不到原因！！！

然后尝试直接在root视图控制器里面设置返回按钮backbarbuttonitem的自定义view,右滑手势可用，但是设置leftbarbuttonitem就不能使用右滑手势：

- (void)viewdidload {
  [super viewdidload];
  // 设置左边的返回按钮
  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;
  }

以上是自己的验证，希望对大家的学习有所帮助，也希望大家多多支持。