iOS学习笔记

一、隐藏状态栏

-(BOOL)prefersStatusBarHidden{
    return YES;
}

 二、在有navigation下的公共视图在添加按钮等控件的时候就不会偏移64

self.automaticallyAdjustsScrollViewInsets = NO;

 三、隐藏tabBar的方法

//1.设置self.tabBarController.tabBar.hidden=YES;
     
self.tabBarController.tabBar.hidden=YES;
 
//2.如果在push跳转时需要隐藏tabBar，设置self.hidesBottomBarWhenPushed=YES;
 
    self.hidesBottomBarWhenPushed=YES;
    NextViewController *next=[[NextViewController alloc]init];
    [self.navigationController pushViewController:next animated:YES];
    self.hidesBottomBarWhenPushed=NO;
 
//并在push后设置self.hidesBottomBarWhenPushed=NO;
//这样back回来的时候，tabBar会恢复正常显示。

四、判断字典某个元素是否为空

[dict[@"name"] isKindOfClass:[NSNull class]];

五、添加导航栏

ViewController * mainVC = [[ViewController alloc] init];
UINavigationController * nav = [[UINavigationController alloc] initWithRootViewController:mainVC];
self.window.rootViewController = nav;

六、UIView添加背景颜色

UIColor *bgColor = [UIColor colorWithPatternImage: [UIImage imageNamed:@"bg.jpg"]];
self.view.backgroundColor = bgColor;