iOS_自定义返回按钮

//在-(void)viewWillAppear:(BOOL)animated方法中添加返回按钮

//返回按钮

    UIButton *leftButton = [UIButton buttonWithType:UIButtonTypeCustom];

    

    leftButton.frame=CGRectMake(0, 0, 60, 25);

    [leftButton setImage:[UIImage imageNamed:@"back_img"] forState:UIControlStateNormal];

    //设置返回按钮的图片，跟系统自带的“<”符合保持一致

    [leftButton addTarget:self action:@selector(back_click:) forControlEvents:UIControlEventTouchUpInside];

//图片 居左，

    [leftButton setContentHorizontalAlignment:UIControlContentHorizontalAlignmentLeft];

    

    UIBarButtonItem *leftItem = [[UIBarButtonItem alloc] initWithCustomView:leftButton];

    //ios7.0系统中，自定义的返回按钮 有点 偏右，需要调整位置

    if(([[[UIDevice currentDevice] systemVersion] floatValue]>=7.0?20:0))

    {

        UIBarButtonItem *negativeSpacer = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace

                                                                                       target:nil action:nil];

        negativeSpacer.width = -8;//这个数值可以根据情况自由变化

        self.navigationItem.leftBarButtonItems = @[negativeSpacer, leftItem];

    }else

    {

        self.navigationItem.leftBarButtonItem = leftItem;

    }