自学知识(三)
1.设置状态栏的样式:
1 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { 2 // Override point for customization after application launch. 3 [UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleLightContent; 4 return YES; 5 }
2.数组的遍历：
- (NSEnumerator *)objectEnumerator;从前向后
- (NSEnumerator *)reverseObjectEnumerator;从后向前
NSArray* reversedArray = [[_myArray reverseObjectEnumerator] allObjects];
3. 设置导航栏的标题样式：
1 NSDictionary *dic = @{NSFontAttributeName:[UIFont systemFontOfSize:40],NSForegroundColorAttributeName:[UIColor redColor]}; 2 3 // self.navigationBar.titleTextAttributes = [NSDictionary dictionaryWithObject:[UIColor blackColor] forKey:NSForegroundColorAttributeName]; 4 self.navigationBar.titleTextAttributes = dic; 5
4.复写pushViewController方法，隐藏标签栏：
1 #pragma mark 隐藏tabbar 2 -(void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated 3 { 4 5 if (self.viewControllers.count > 0) { 6 viewController.hidesBottomBarWhenPushed = YES; 7 } 8 [super pushViewController:viewController animated:YES]; 9 }
5.
IOS7之后 self.edgesForExtendedLayout=UIRectEdgeNone;
self.automaticallyAdjustsScrollViewInsets=NO;
只要设置了 self.edgesForExtendedLayout ，UIRectEdgeAll的时候会让tableView从导航栏下移44px，设置为UIRectEdgeNone的时候，刚刚在导航栏下面。
self.edgesForExtendedLayout=UIRectEdgeNone or UIRectEdgeAll;
self.automaticallyAdjustsScrollViewInsets=YES;
有的时候只要automaticallyAdjustsScrollViewInsets设置了YES，不管其他任何值tableView都会在导航栏下面，
手动改self.tableView.contentInset=UIEdgeInsetsMake(64, 0, 0, 0);也不影响tableView在导航栏下面。
6.设置选中TabBarItem的样式和正常状态样式:
1 [[UITabBarItem appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIColor grayColor], NSForegroundColorAttributeName, nil] forState:UIControlStateNormal]; 2 3 [[UITabBarItem appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIColor blackColor], NSForegroundColorAttributeName, nil] forState:UIControlStateSelected]; 4
7.不设置渲染,会是系统默认的蓝色效果:
1 if (iOS7) { 2 childController.tabBarItem.image = [normal imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal]; 3 childController.tabBarItem.selectedImage = [selected imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal]; 4 }else{ 5 childController.tabBarItem.selectedImage = selected; 6 } 7
设置UIImage的渲染模式：UIImage.renderingMode
着色（Tint Color）是iOS7界面中的一个.设置UIImage的渲染模式：UIImage.renderingMode重大改变，你可以设置一个UIImage在渲染时是否使用当前视图的Tint Color。UIImage新增了一个只读属性：renderingMode，对应的还有一个新增方法：imageWithRenderingMode:，它使用UIImageRenderingMode枚举值来设置图片的renderingMode属性。该枚举中包含下列值：
- UIImageRenderingModeAutomatic // 根据图片的使用环境和所处的绘图上下文自动调整渲染模式。
- UIImageRenderingModeAlwaysOriginal // 始终绘制图片原始状态，不使用Tint Color。
- UIImageRenderingModeAlwaysTemplate // 始终根据Tint Color绘制图片，忽略图片的颜色信息。
8.
//不设置此处会导致View上移
if(iOS7) {
self.edgesForExtendedLayout = UIRectEdgeNone;
self.extendedLayoutIncludesOpaqueBars = NO;
self.modalPresentationCapturesStatusBarAppearance = NO;
}
9.网络请求注意点:
1 + (void)getWithURL:(NSString *)url params:(NSDictionary *)params success:(HttpSuccess)success failure:(HttpFailure)failure{ 2 //1.使用 NSURLConnection版本的AFNetworking 3 //1.1创建一个AFN管理对象 4 AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager]; 5 //1.2告诉manager只下载原始数据, 不要解析数据(一定要写) 6 //AFN即可以下载网络数据, 又可以解析json数据,如果不写下面的 自动就解析json 7 //由于做服务器的人返回json数据往往不规范, 凡是AFN又检查很严格,导致json解析往往失败 8 //下面这句话的意思是 告诉AFN千万别解析, 只需要给我裸数据就可以 9 manager.responseSerializer = [AFHTTPResponseSerializer serializer]; 10 [manager GET:url parameters:params success:^(AFHTTPRequestOperation *operation, id responseObject) { 11 NSData *data = operation.responseData; 12 NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil]; 13 if (success) { 14 success(dict); 15 } 16 }failure:^(AFHTTPRequestOperation *operation, NSError *error) { 17 if (failure) { 18 failure(error); 19 } 20 }]; 21 }
