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//返回按钮

-(void)addbackBtn{

    UIButton *bbtn=[[UIButton alloc]initWithFrame:CGRectMake(0, 0, 60, 30)];

    [bbtn setImage:[UIImage imageNamed:@"icon_navigation_back"] forState:UIControlStateNormal];

    [bbtn addTarget:self action:@selector(backBtn) forControlEvents:UIControlEventTouchDown];

    UIBarButtonItem *fixBtn=[[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:self action:nil];

    fixBtn.width=-30;

    UIBarButtonItem *backbtn=[[UIBarButtonItem alloc]initWithCustomView:bbtn];

    NSArray *btnArr=@[fixBtn,backbtn];

    self.navigationItem.leftBarButtonItems=btnArr;

}

-(void)backBtn{

        [self.navigationController popViewControllerAnimated:YES];

}

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