//
// ViewController.m
// 3、异步请求
//
// Created by yongma00 on 15/12/10.
// Copyright © 2015年 yongma. All rights reserved.
//
#import "ViewController.h"
@interface ViewController ()
- (IBAction)btnPressed:(id)sender;
@property (weak, nonatomic) IBOutlet UILabel *label;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)btnPressed:(id)sender {
//1、生成请求的url
NSString *str=@"http://192.168.0.100:8080/MJServer/login";
NSURL *url=[NSURL URLWithString:str];
NSData *postData=[@"username=123&pwd=123&type=JSON" dataUsingEncoding:NSUTF8StringEncoding];
//2、根据请求生成对应的Request
NSMutableURLRequest *request=[NSMutableURLRequest requestWithURL:url];
[request setHTTPMethod:@"POST"];
[request setHTTPBody:postData];
//3、连接(异步)
NSOperationQueue *queue=[[NSOperationQueue alloc]init];
[NSURLConnection sendAsynchronousRequest:request queue:queue completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {
// NSLog(@"%@",[NSThread currentThread]);
//不是主线程，所以需要回到主线程跟新UI
NSString *text=[[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
// [self.label performSelectorOnMainThread:@selector(setText:) withObject:text waitUntilDone:YES];
// [[NSOperationQueue mainQueue]addOperationWithBlock:^{
// self.label.text=text;
// }];
dispatch_async(dispatch_get_main_queue(), ^{
self.label.text=text;
});
}];
}
/*
回到主线程
1、 [self.label performSelectorOnMainThread:@selector(setText:) withObject:text waitUntilDone:YES];
2、 [[NSOperationQueue mainQueue]addOperationWithBlock:^{
self.label.text=text;
}];
3、 dispatch_async(dispatch_get_main_queue(), ^{
self.label.text=text;
});
*/
@end