统一修改状态栏样式

    // 1、首先苏姚到info.plist文件中添加最后一个字段；View controller-based status bar appearance
    // 2。然后在AppDelegate内实现
    [UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleLightContent;

/改变状态栏背景颜色
UIView *statusBarView=[[UIView alloc] initWithFrame:CGRectMake(0, 0, kWidth, 50)];
    
    statusBarView.backgroundColor=[UIColor tintColor];
    
    [self.view addSubview:statusBarView];
    
    [UIApplication sharedApplication].statusBarStyle  = UIStatusBarStyleLightContent;