iOS9.0之后那些被不推荐使用(deprecated)方法之:sendAsynchronousRequest 和 UIAlertView html
1、UIAlertview服务器
在Xcode7 ,iOS9.0的SDK中,已经明确提示再也不推荐使用UIAlertView,而只能使用UIAlertController;session
点击一个按钮,而后弹出提示框的示例代码以下:ide
#import "ViewController.h" @interface ViewController () @property(strong,nonatomic) UIButton *button; @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; self.button = [[UIButton alloc] initWithFrame:CGRectMake(0, 100, [[UIScreen mainScreen] bounds].size.width, 20)]; [self.button setTitle:@"跳转" forState:UIControlStateNormal]; [self.button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal]; [self.view addSubview:self.button]; [self.button addTarget:self action:@selector(clickMe:) forControlEvents:UIControlEventTouchUpInside]; } -(void)clickMe:(id)sender{ UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" message:@"按钮被点击了" delegate:self cancelButtonTitle:@"肯定" otherButtonTitles:nil, nil nil]; [alert show]; } @end
可是会有警告:“‘UIAlertView’ is deprecated:first deprecated in iOS 9.0 - UIAlertView is deprecated.。。。代表UIAlertView已经iOS9中被弃用(不推荐)使用。推荐使用UIAlertController。atom
为解决这个warning,使用UIAlertController来解决这个问题。代码以下:url
#import "ViewController.h" @interface ViewController () @property(strong,nonatomic) UIButton *button; @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; self.button = [[UIButton alloc] initWithFrame:CGRectMake(0, 100, [[UIScreen mainScreen] bounds].size.width, 20)]; [self.button setTitle:@"跳转" forState:UIControlStateNormal]; [self.button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal]; [self.view addSubview:self.button]; [self.button addTarget:self action:@selector(clickMe:) forControlEvents:UIControlEventTouchUpInside]; } -(void)clickMe:(id)sender{ //初始化提示框; UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"提示" message:@"按钮被点击了" preferredStyle: UIAlertControllerStyleAlert]; [alert addAction:[UIAlertAction actionWithTitle:@"肯定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) { //点击按钮的响应事件; }]]; //弹出提示框; [self presentViewController:alert animated:true completion:nil]; } @end
经过运行发下,程序运行后的效果相同。 其中preferredStyle这个参数还有另外一个选择:UIAlertControllerStyleActionSheet。选择这个枚举类型后,实现效果:提示框会从底部弹出。spa
-》对比:经过查看代码还能够发现,在提示框中的按钮响应再也不须要delegate委托来实现了。直接使用addAction就能够在一个block中实现按钮点击,很是方便。code
2、NSURLSession替换NSURLConnectionorm
最近使用[NSURLConnection sendAsynchronousRequest]时已经警告为不推荐使用了,苹果官方推荐使用NSURLSession中的dataTaskWithRequest方法。htm
用NSURLConnection实现的示例代码以下:
NSOperationQueue *queue = [[NSOperationQueue alloc] init]; [NSURLConnection sendAsynchronousRequest:urlRequest queue:queue completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) { if ([data length] >0 && error == nil){ NSString *html = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]; resault=[html copy]; NSLog(@返回的服务器数据 = %@, html); } else if ([data length] == 0 && error == nil){ NSLog(@Nothing was downloaded.); } else if (error != nil){ NSLog(@发生错误 = %@, error); } }];
推荐使用NSURLSession方法实现以下:
//推荐使用这种请求方法; NSURLSession *session = [NSURLSession sharedSession]; __block NSString *result = @; NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:urlRequest completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) { if (!error) { //没有错误,返回正确; result = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]; NSLog(@返回正确:%@,result); }else{ //出现错误; NSLog(@错误信息:%@,error); } }]; [dataTask resume];