json解析中活动指示器的使用答案

【问题标题】：Use of activity indicator in json parsingjson解析中活动指示器的使用
【发布时间】：2016-05-27 06:51:57
【问题描述】：

我正在处理应用程序，并且在登录过程中我必须使用活动指示器，我没有得到我必须在下面的代码中使用活动指示器代码的地方：-

- (IBAction)Login:(id)sender
{
    NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
    NSURLSession *session = [NSURLSession sessionWithConfiguration:configuration delegate:self delegateQueue:nil];

    NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:BaseUrl@"login"]];

    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url
                                                           cachePolicy:NSURLRequestUseProtocolCachePolicy
                                                       timeoutInterval:60.0];

    [request addValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];


    [request addValue:@"*/*" forHTTPHeaderField:@"Accept"];

    [request setHTTPMethod:@"POST"];

    NSString *mapData = [NSString stringWithFormat:@"userName=g&userPassword=123456&api_key=ZWZ&api_password=1" ];

    NSData *postData = [mapData dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];

    [request setHTTPBody:postData];


    NSURLSessionDataTask *postDataTask = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {

        if(error == nil)
        {

            NSString * text = [[NSString alloc] initWithData: data encoding: NSUTF8StringEncoding];
            NSLog(@"text= %@",text);

            NSError *error = nil;
            NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];

            if(error!=nil)
            {
                NSLog(@"error = %@",error);

            }

            dispatch_async(dispatch_get_main_queue(), ^{
                [self checkUserSuccessfulLogin:json];
            });
        }
        else{

            NSLog(@"Error : %@",error.description);

        }


    }];


    [postDataTask resume];




}

登录后进入另一个页面需要一些时间。请帮帮我。

【问题讨论】：

我们可以帮助确定放置位置，但至少可以尝试活动指示器代码

标签： ios objective-c json activity-indicator

【解决方案1】：

使用下面的代码

//main thread
UIActivityIndicatorView *spinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
spinner.center = CGPointMake([[UIScreen mainScreen]bounds].size.width/2, [[UIScreen mainScreen]bounds].size.height/2);

//if you want to add to window, use this below one
[appdelegate.window addSubview:spinner];

//or if you want to add to view, use below one
 [self.view addSubView:spinner];

[spinner startAnimating];


dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_LOW, 0),^{

    dispatch_async(dispatch_get_main_queue(), ^{

   //after your server call or parsing or something you can call this to stop animating 

   [spinner stopAnimating];
  });
  });

【讨论】：

什么时候停止微调器？
在你的解析或任何服务器调用完成后，你可以调用[spinner stopAnimating]方法。

【解决方案2】：

阿卡什，

您可以使用 MBProgressHUD 第三方框架，您无需编写将活动指示器添加到屏幕的代码，所有（无需重新发明轮子）这里有一个链接 :) https://github.com/jdg/MBProgressHUD

添加一个 pod 依赖项或将文件添加到您的项目中，但您觉得舒服。

导入文件。

#import <MBProgressHUD/MBProgressHUD.h>

    - (IBAction)Login:(id)sender
    {
        //add the MBProgressHud here before you make the webservice call
        MBProgressHUD *hud = [[MBProgressHUD alloc] initWithView:self.navigationController.view];
        hud.labelText = NSLocalizedString(@"Login in progress", nil);

        [self.navigationController.view addSubview:self.HUD];

        NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
        NSURLSession *session = [NSURLSession sessionWithConfiguration:configuration delegate:self delegateQueue:nil];

        NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:BaseUrl@"login"]];

        NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url
                                                               cachePolicy:NSURLRequestUseProtocolCachePolicy
                                                           timeoutInterval:60.0];

        [request addValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];


        [request addValue:@"*/*" forHTTPHeaderField:@"Accept"];

        [request setHTTPMethod:@"POST"];

        NSString *mapData = [NSString stringWithFormat:@"userName=g&userPassword=123456&api_key=ZWZ&api_password=1" ];

        NSData *postData = [mapData dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];

        [request setHTTPBody:postData];


        NSURLSessionDataTask *postDataTask = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
            dispatch_async(dispatch_get_main_queue(), ^{
            //finally hide it, whether its sucess or failure just remove it 
            [MBProgressHUD hideHUDForView:self.navigationController.view animated:YES];
            });
            if(error == nil)
            {

                NSString * text = [[NSString alloc] initWithData: data encoding: NSUTF8StringEncoding];
                NSLog(@"text= %@",text);

                NSError *error = nil;
                NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];

                if(error!=nil)
                {
                    NSLog(@"error = %@",error);

                }

                dispatch_async(dispatch_get_main_queue(), ^{
                    [self checkUserSuccessfulLogin:json];
                });
            }
            else{

                NSLog(@"Error : %@",error.description);

            }


        }];


        [postDataTask resume];
}

【讨论】：

@alok : 在你发表评论之前我做了，请看一下

【解决方案3】：

我更新了活动指示器的代码。

只需在.h文件中制作活动指示器的出口即可。

@property (weak,nonatomic) UIActivityIndicatorView *indicator;

然后，在 .m 文件的 viewDidLoad() 中写入以下代码。

self.indicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
self.indicator.center = CGPointMake([[UIScreen mainScreen]bounds].size.width/2, [[UIScreen mainScreen]bounds].size.height/2);

下面是Json解析的代码：

- (IBAction)Login:(id)sender
{

    [self.indicator startAnimating];//The ActivityIndicator Starts Animating Here

    NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
    NSURLSession *session = [NSURLSession sessionWithConfiguration:configuration delegate:self delegateQueue:nil];

    NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:BaseUrl@"login"]];

    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url
                                                       cachePolicy:NSURLRequestUseProtocolCachePolicy
                                                   timeoutInterval:60.0];

    [request addValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];


    [request addValue:@"*/*" forHTTPHeaderField:@"Accept"];

    [request setHTTPMethod:@"POST"];

    NSString *mapData = [NSString stringWithFormat:@"userName=g&userPassword=123456&api_key=ZWZ&api_password=1" ];

    NSData *postData = [mapData dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];

    [request setHTTPBody:postData];


    NSURLSessionDataTask *postDataTask = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {

    if(error == nil)
    {
        dispatch_async(dispatch_get_main_queue(), ^{

             [self.indicator stopAnimating];//The ActivityIndicator Stops Animating when Response Arrives

             NSString * text = [[NSString alloc] initWithData: data encoding: NSUTF8StringEncoding];
             NSLog(@"text= %@",text);

             NSError *error = nil;
             NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];

             [self checkUserSuccessfulLogin:json];
        });
    }
    else
    {
        dispatch_async(dispatch_get_main_queue(), ^{

             [self.indicator stopAnimating];
        });
        NSLog(@"Error : %@",error.description);
    }
 }];

 [postDataTask resume];

}

【讨论】：

【解决方案4】：

 - (IBAction)Login:(id)sender

 {
//show or add youar activity indicator here


NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
NSURLSession *session = [NSURLSession sessionWithConfiguration:configuration delegate:self delegateQueue:nil];

NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:BaseUrl@"login"]];

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url
                                                       cachePolicy:NSURLRequestUseProtocolCachePolicy
                                                   timeoutInterval:60.0];

[request addValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];


[request addValue:@"*/*" forHTTPHeaderField:@"Accept"];

[request setHTTPMethod:@"POST"];

NSString *mapData = [NSString stringWithFormat:@"userName=g&userPassword=123456&api_key=ZWZ&api_password=1" ];

NSData *postData = [mapData dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];

[request setHTTPBody:postData];


NSURLSessionDataTask *postDataTask = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {

    //Hide or remove your activity indicator here


    if(error == nil)
    {

        NSString * text = [[NSString alloc] initWithData: data encoding: NSUTF8StringEncoding];
        NSLog(@"text= %@",text);

        NSError *error = nil;
        NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];

        if(error!=nil)
        {
            NSLog(@"error = %@",error);

        }

        dispatch_async(dispatch_get_main_queue(), ^{
            [self checkUserSuccessfulLogin:json];
        });
    }
    else{

        NSLog(@"Error : %@",error.description);

    }


}];


[postDataTask resume];




}

当我在您的代码中添加 cmets 时，在方法的最开始显示您的活动指示器，因为用户点击按钮启动并从完成处理程序中隐藏它，因为完成处理程序在响应来自服务器后调用。

希望这会有所帮助:)

【讨论】：

【解决方案5】：

试试这个代码

-(IBAction)Login:(id)sender
{

    UIActivityIndicatorView *activityView = [[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
    CGRect activityFrame = CGRectMake(130,10,40,40);
    [activityView setFrame: activityFrame];
    dispatch_async(dispatch_get_main_queue(), ^{
        [self.view addSubview:activityView];
        activityView.center = self.view.center;
        [activityView startAnimating];
        [self.view bringSubviewToFront:activityView];

    });

    NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
    NSURLSession *session = [NSURLSession sessionWithConfiguration:configuration delegate:self delegateQueue:nil];

    NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:BaseUrl@"login"]];

    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url
                                                           cachePolicy:NSURLRequestUseProtocolCachePolicy
                                                       timeoutInterval:60.0];

    [request addValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];


    [request addValue:@"*/*" forHTTPHeaderField:@"Accept"];

    [request setHTTPMethod:@"POST"];

    NSString *mapData = [NSString stringWithFormat:@"userName=g&userPassword=123456&api_key=ZWZ&api_password=1" ];

    NSData *postData = [mapData dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];

    [request setHTTPBody:postData];


    NSURLSessionDataTask *postDataTask = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {

        if(error == nil)
        {

            NSString * text = [[NSString alloc] initWithData: data encoding: NSUTF8StringEncoding];
            NSLog(@"text= %@",text);

            NSError *error = nil;
            NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];

            if(error!=nil)
            {
                NSLog(@"error = %@",error);

            }

            dispatch_async(dispatch_get_main_queue(), ^{
                [activityView stopAnimating];
             [activityView removeFromSuperview];
                [self checkUserSuccessfulLogin:json];
            });
        }
        else{

            NSLog(@"Error : %@",error.description);

        }


    }];


    [postDataTask resume];




}

【讨论】：