IOS开发基础知识--碎片6
三十三:IOS多视图跳转方法
第一种： 跳转：[self presentModalViewController:control animated:YES]; 返回：[self dismissModalViewControllerAnimated:YES]; 第二种： 跳转：[self.navigationController pushViewController:subTableViewController animated:YES]; 返回：[self.navigationController popViewControllerAnimated:YES]; 第三种:自己控制： [self.view addSubview:<#(UIView *)#>] [self.view removeFromSuperview]; 注意:pushViewController和popViewController进行视图间的切换，就必须要求当前视图是个NavigationController,
第四种：
// 根据Segue ID 执行跳转
[self performSegueWithIdentifier:@"contactList" sender:nil];
三十四:presentModalViewController与dismissModalViewControllerAnimated注意事项
在实际开发中，如果要弹出视图： 我们常用到presentModalViewController方法和dismissModalViewControllerAnimated方法。 presentModalViewController：弹出视图 dismissModalViewControllerAnimated：隐藏视图 弹出视图： FeedbackViewController *feedbackViewController = [[FeedbackViewController alloc]initWithNibName:@"FeedbackViewController" bundle:nil]; UINavigationController *navigationController = [[UINavigationController alloc]initWithRootViewController:feedbackViewController]; [self presentModalViewController:navigationController animated:YES]; 隐藏视图： [self dismissModalViewControllerAnimated:YES]; 关于这两个方法的几点说明： 1.iPhone上弹出/隐藏 视图时，使用为全屏模式 2.搞清楚谁是presenting，谁是presented 如果A弹出B，那么A为presenting，B为presented。 3.隐藏视图的策略 我们假如A弹出B 就是说，A负责隐藏B；如果我们在B中调用dismissModalViewControllerAnimated方法，那么编译器，自动将消息发送给A。 等等，什么消息？ 简单的理解，当执行presentModalViewController:方法：在A弹出B时： 执行A的viewWillDisappear方法， 通知B执行自己的viewWillAppear方法和viewDidAppear 执行A的viewDidDisappear方法 当执行dismissModalViewControllerAnimated方法：隐藏B时： 执行B的viewWillDisappear 通知A执行自己的viewWillAppear方法和viewDidAppear方法 执行B的viewDidDisappear方法 以下我做了个测试来输出一轮AB切换： A：More B：Feed 2012-12-27 14:01:23.666 WTV[1627:11303] -More--viewWillDisappear---- 2012-12-27 14:01:23.672 WTV[1627:11303] -Feed--viewWillAppear---- 2012-12-27 14:01:24.086 WTV[1627:11303] -Feed--viewDidAppear---- 2012-12-27 14:01:24.087 WTV[1627:11303] -More--viewDidDisappear---- 2012-12-27 14:01:25.745 WTV[1627:11303] -Feed--viewWillDisappear---- 2012-12-27 14:01:25.745 WTV[1627:11303] -More--viewWillAppear---- 2012-12-27 14:01:26.156 WTV[1627:11303] -More--viewDidAppear---- 2012-12-27 14:01:26.157 WTV[1627:11303] -Feed--viewDidDisappear---- 当我们信心慢慢，庆幸我们可以了解了这两个方法时，悲剧发生了： 4.苹果官方已经把这两个方法 Deprecated in iOS 6.0. 了 - (void)presentModalViewController:(UIViewController *)modalViewController animated:(BOOL)animated; - (void)dismissModalViewControllerAnimated:(BOOL)animated; 取而代之的是： [self presentViewController:navigationController animated:YES completion:^(void){ // Code }]; [self dismissViewControllerAnimated:YES completion:^(void){ // Code }]; 新接口的差别是提供了一个参数，允许你传入一个block。这个block的回调方法在VC的viewWillDisappear方法后调用。也就是被隐藏的VC对象被释放后运行回调。 这样做的好处：可以方便做多个UI效果之间的衔接和转换。
三十五：视图跳载的几种动画
BaiDuViewController* baiduController=[mainStoryboard instantiateViewControllerWithIdentifier:@"baiduStoryboard"]; baiduController.modalTransitionStyle=UIModalTransitionStyleFlipHorizontal; [self presentViewController:baiduController animated:YES completion:^{ }];
- UIModalTransitionStyleCoverVertical //新视图从下向上出现
- UIModalTransitionStyleFlipHorizontal //以设备的长轴为中心翻转出现
- UIModalTransitionStyleCrossDissolve //渐渐显示
- UIModalTransitionStylePartialCurl //原视图向上卷起
三十六：JSONKit的使用方法
json开源的类库有很多，其中JSONKit库是非常简单易用而且效率又比较高的，重要的JSONKit适用于ios 5.0以下的版本。 下载地址：https://github.com/johnezang/JSONKit 使用JSONKit库来解析json文件，只需要下载JSONKit.h 和JSONKit.m添加到工程中，设置支持arc，在项目中build phases中的compile sources，选择jsonkit.m然后确认键输入－fno-objc-arc #import "JSONKit.h" //假设 strJson 是网络上接收到的 json 字符串， NSString *strJson = @"[{\"Id\": 1,\"BrandName\": \"爱马仕\" },{\"Id\": 2,\"BrandName\": \"安娜苏\"}]"; NSArray *arrlist=[strJson objectFromJSONString]; NSLog(@"%d",[arrlist count]); for (int i=0; i<[arrlist count]; i++) { NSDictionary *item=[arrlist objectAtIndex:i]; NSString *BrandName=[item objectForKey:@"BrandName"]; NSLog(@"%@",BrandName); } 字典arrlist便是解析好的json文件了。 JSONKit库也可以用来生成json文件 NSMutableDictionary *jsonDic = [NSMutableDictionary dictionary]; NSMutableDictionary *alert = [NSMutableDictionary dictionary] ;NSMutableDictionary *aps = [NSMutableDictionary dictionary]; [alert setObject:@"a msg come!" forKey:@"body"]; [aps setObject:alert forKey:@"alert"]; [aps setObject:@"3" forKey:@"bage" ]; [aps setObject:@"def.mp3" forKey:@"sound"]; [jsonDic setObject:aps forKey:@"aps"]; NSString *strJson = [jsonDic JSONString]; 另一个，其中operation.responseString就是下面那串json字符串，通过它进行解析： NSDictionary* resultDictionary=[operation.responseString objectFromJSONStringWithParseOptions:JKParseOptionLooseUnicode]; NSLog(@"%@ Items Found!",[resultDictionary objectForKey:@"weatherinfo"]); //{"weatherinfo":{"city":"北京","cityid":"101010100","temp":"3","WD":"北风","WS":"3级","SD":"24%","WSE":"3","time":"11:25","isRadar":"1","Radar":"JC_RADAR_AZ9010_JB","njd":"暂无实况","qy":"1028"}} self.weaLableInfo.text=[NSString stringWithFormat:@"城市：%@,温度:%@",[[resultDictionary objectForKey:@"weatherinfo"]objectForKey:@"city"],[[resultDictionary objectForKey:@"weatherinfo"]objectForKey:@"temp"]];
三十七：三十五：afnetworking2.0运用，结合json，引入afnetworking文件后，引入头文件就可以使用，支持arc
- (IBAction)JsonAction:(UIBarButtonItem *)sender { NSString* weatherUrl=[NSString stringWithFormat:@"%@%@.html",BaseURLString,self.UrlString]; AFHTTPRequestOperationManager* manager=[AFHTTPRequestOperationManager manager]; manager.responseSerializer.acceptableContentTypes = [NSSet setWithObject:@"text/html"]; [manager GET:weatherUrl parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) { NSDictionary* resultDictionary=[operation.responseString objectFromJSONStringWithParseOptions:JKParseOptionLooseUnicode]; NSLog(@"%@ Items Found!",[resultDictionary objectForKey:@"weatherinfo"]); //{"weatherinfo":{"city":"北京","cityid":"101010100","temp":"3","WD":"北风","WS":"3级","SD":"24%","WSE":"3","time":"11:25","isRadar":"1","Radar":"JC_RADAR_AZ9010_JB","njd":"暂无实况","qy":"1028"}} self.weaLableInfo.text=[NSString stringWithFormat:@"城市：%@,温度:%@",[[resultDictionary objectForKey:@"weatherinfo"]objectForKey:@"city"],[[resultDictionary objectForKey:@"weatherinfo"]objectForKey:@"temp"]]; } failure:^(AFHTTPRequestOperation *operation, NSError *error) { NSLog(@"Error:%@",error); }]; } 带post参数到服务端 AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager]; //申明返回的结果是json类型 manager.responseSerializer = [AFJSONResponseSerializer serializer]; //申明请求的数据是json类型 manager.requestSerializer=[AFJSONRequestSerializer serializer]; //如果报接受类型不一致请替换一致text/html或别的 manager.responseSerializer.acceptableContentTypes = [NSSet setWithObject:@"text/html"]; //传入的参数 NSDictionary *parameters = @{@"1":@"XXXX",@"2":@"XXXX",@"3":@"XXXXX"}; //你的接口地址 NSString *url=@"http://xxxxx"; //发送请求 [manager POST:url parameters:parameters success:^(AFHTTPRequestOperation *operation, id responseObject) { NSLog(@"JSON: %@", responseObject); } failure:^(AFHTTPRequestOperation *operation, NSError *error) { NSLog(@"Error: %@", error); }];
