IOS--POST异步请求

TestController.m

 1 #import "TestController.h"
 2
 3 @interface TestController()
 4
 5 @property(nonatomic,strong)UIButton *button;
 6
 7 @end
 8
 9 @implementation TestController
10
11 - (void)viewDidLoad
12 {
13     [super viewDidLoad];
14
15     _button = [UIButton buttonWithType:UIButtonTypeSystem];
16
17     _button.frame = CGRectMake(0, 20, 100, 20);
18     [_button setTitle:@"Hello" forState:UIControlStateNormal];
19
20     [_button addTarget:self action:@selector(start:) forControlEvents:UIControlEventTouchUpInside];
21
22
23     [self.view addSubview:_button];
24
25 }
26
27 -(void)start:(UIButton*)sender
28 {
29     //http://php.weather.sina.com.cn/xml.php?city=%B1%B1%BE%A9&password=DJOYnieT8234jlsK&day=0
30
31     //获取URL
32     NSURL *url = [NSURL URLWithString:@"http://php.weather.sina.com.cn/xml.php"];
33     NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
34
35     //POST方式
36     [request setHTTPMethod:@"POST"];
37     NSString *param = @"city=%B1%B1%BE%A9&password=DJOYnieT8234jlsK&day=0";
38     NSData *body = [param dataUsingEncoding:NSUTF8StringEncoding];
39     [request setHTTPBody:body];
40
41
42     //异步请求
43     [NSURLConnection sendAsynchronousRequest:request queue:[[NSOperationQueue alloc]init] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {
44
45         NSString *content = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
46
47         NSLog(@"数据:%@",content);
48
49     }];
50
51 }
52
53 @end