IOS用GCD调接口
程序员文章站
2022-05-28 22:51:00
...
本文以UIActivityIndicatorView为例,有没有同学试过调接口,调接口的时候会不会想要有个UIActivityIndicatorView去转圈圈来表示正在等待呢?但是你如果直接调接口的话,即使你用UIActivityIndicatorView ,会不会怎么也无法显示呢? 如果遇到这种情况,用GCD就可以,不过好麻烦就是了……
- (IBAction)queryUser:(id)sender { [telephoneTextField resignFirstResponder]; //开始转圈圈 [indicator setHidden:NO]; [indicator setHidesWhenStopped:YES]; [indicator startAnimating];//转圈圈 //采用GCD,如果调接口成功或者失败,圈圈停止 dispatch_async(dispatch_get_global_queue(0, 0), ^{ NSString *telephone = telephoneTextField.text; if ([telephone length] == 0) { //执行主线程 dispatch_async(dispatch_get_main_queue(), ^{ UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"业务号码不能为空" message:@"请重新输入条件查询!" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil]; [alertView show]; [alertView release]; [indicator stopAnimating];//停止圈圈 }); return; } //调用接口 UserQueryBO *userQueryBO = [[UserQueryBO alloc] init]; NSDictionary *resultList = [userQueryBO queryUser:telephone forUser:nil]; //接口返回值 NSString *returnCode = [NSString stringWithFormat:@""]; NSString *message= [NSString stringWithFormat:@""]; NSString *resultInfo= [NSString stringWithFormat:@""]; if (resultList != nil) { returnCode = [resultList objectForKey:@"ReturnCode"]; message = [resultList objectForKey:@"Message"]; resultInfo = [resultList objectForKey:@"ResultInfo"]; //NSLog(@"%@", resultInfo); } if ([returnCode isEqualToString:@"0"]) { if ([resultInfo length] > 0) { //成功调用主线程,利用主线程里navigationController去打开新页面 dispatch_async(dispatch_get_main_queue(), ^{ UserQueryShowVC *userQueryShowVC = [[UserQueryShowVC alloc] init]; userQueryShowVC.userInfo = resultInfo; [self.navigationController pushViewController:userQueryShowVC animated:YES]; self.navigationController.title = @"用户查询详情"; [userQueryShowVC release]; }); } else { //接口调用失败,利用主线程打开输入框 dispatch_async(dispatch_get_main_queue(), ^{ UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"没查询到相关用户信息" message:@"请重新输入条件查询!" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil]; [alertView show]; [alertView release]; [indicator stopAnimating];//停止圈圈 }); } } else { //接口调用失败,利用主线程打开输入框 dispatch_async(dispatch_get_main_queue(), ^{ UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"查询失败" message:[@"请重新输入条件查询!失败信息:" stringByAppendingString:message] delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil]; [alertView show]; [alertView release]; [indicator stopAnimating];//停止圈圈 }); } //[resultInfo release]; //[message release]; //[returnCode release]; [userQueryBO release]; //这里,保险起见,再停止圈圈…… dispatch_async(dispatch_get_main_queue(), ^{ [indicator stopAnimating]; }); }); }
代码如上,用//采用GCD
dispatch_async(dispatch_get_global_queue(0, 0), ^{});将接口逻辑放在这里,如果需要停止圈圈或者弹出对话框,则用
dispatch_async(dispatch_get_main_queue(), ^{
[indicator stopAnimating];
});
去会写数据到主线程。
记得,不这样的话会报错的说
上一篇: oracle start with CONNECT BY
下一篇: IOS用GCD调接口