ios 开发中的一些小常识  陆续更新

可以写在define中的一些全局变量

//导航栏 状态栏 设置gao du
#define statusRect [[UIApplication sharedApplication] statusBarFrame].size.height
#define navRect self.navigationController.navigationBar.frame.size.height

#define topHeight (statusRect + navRect)(这个是获取导航栏和状态栏的高度,不要在继续64了,我们程序员应该精益求精啊)

获取颜色的rgb 转换

#define UIColorFromHex(s) [UIColor colorWithRed:(((s & 0xFF0000) >> 16 )) / 255.0 green:((( s & 0xFF00 ) >> 8 )) / 255.0 blue:(( s & 0xFF )) / 255.0 alpha:1.0]

怎么用??看实例----

self.navigationController.navigationBar.barTintColor = UIColorFromHex(0X1C86EE);//这样就可以了  把获取的颜色rgb #FFDEAD 前面的#换做0X就可以了  往后的颜色全是你定了,适合那些没有美工支持的集设计与开发一身的二阶程序员

走一下快速建立tabbar的步骤吧

建立一个继承与UItabbarcontroller的view  .m文件中写下这些就够了哦,然后Appdelegate里面怎么写,这个就很随意了,温馨提示,在下也是小白,但是经过测试发现  图片用_@3x的简直不要太合适哦

- (void)viewDidLoad {

    [super viewDidLoad];

    [self setupItem];

    [self setupChildVC];

 

}

- (void)setupItem{
    //正常情况下图标下方文字的显示属性
    NSMutableDictionary *normalTextAtts = [NSMutableDictionary dictionary ];
    //文字颜色
    normalTextAtts[NSForegroundColorAttributeName] = [UIColor grayColor];
    //选中情况下文字的颜色属性
    NSMutableDictionary *selectAtts = [NSMutableDictionary dictionary];
    //文字颜色
    selectAtts[NSForegroundColorAttributeName] = UIColorFromHex(0X1C86EE);
   
    //统一设置baritem的属性
    UITabBarItem *tabItem = [UITabBarItem appearance];
    [tabItem setTitleTextAttributes:normalTextAtts forState:UIControlStateNormal];
    [tabItem setTitleTextAttributes:selectAtts forState:UIControlStateSelected];
   
}
- (void)setupChildVC{
   
  
    [self setupChildvc:[[mainViewController alloc]init] titile:@"首页" normalImage:@"首页(4)_@3x" selectImage:@"首页(5)_@3x"];
 
    [self setupChildvc:[[ViewController alloc]init] titile:@"个人中心" normalImage:@"我的(4)_@3x" selectImage:@"我的(5)_@3x"];
  
   
}
//结构化封装子视图
- (void)setupChildvc:(UIViewController*)vc titile:(NSString*)title normalImage:(NSString*)image selectImage:(NSString*)simage{
   
    UINavigationController *nav = [[UINavigationController alloc]initWithRootViewController:vc];
 
    [[UITabBar appearance] setBarTintColor:[UIColor whiteColor]];
   
    nav.tabBarItem.title = title;
    nav.tabBarItem.image = [[UIImage imageNamed:image] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
    nav.tabBarItem.selectedImage = [[UIImage imageNamed:simage] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
    //nav.view.backgroundColor = [UIColor colorWithRed:arc4random_uniform(100)/100.0 green:arc4random_uniform(100)/100.0 blue:arc4random_uniform(100)/100.0 alpha:1.0];
    nav.view.backgroundColor = [UIColor whiteColor];
    [self addChildViewController:nav];
   
}