小编ini*_*iOS的帖子

我想制作带圆角的UIbarbuttonItem(右侧).我提到的链接实现仍然没有得到.图像来自URL.我的代码是,

 dispatch_async(dispatch_get_global_queue(0,0), ^{

 NSData * data = [[NSData alloc] initWithContentsOfURL: [NSURL   URLWithString:userImage]];
    if ( data == nil )
        return;
    dispatch_async(dispatch_get_main_queue(), ^{
        // WARNING: is the cell still using the same data by this point??
        UIImage *img = [UIImage imageWithData: data];

        UIImage *btnImage = [self imageWithImage:img scaledToSize:CGSizeMake(50, 50)];
        UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
        // btn.bounds = CGRectMake( 0, 0, btnImage.size.width, btnImage.size.height );
        [btn addTarget:self action:@selector(action:) forControlEvents:UIControlEventTouchDown];
        [btn setImage:btnImage forState:UIControlStateNormal];
        UIBarButtonItem *btnItem = [[UIBarButtonItem alloc] initWithCustomView:btn];
        self.navigationItem.rightBarButtonItem = btnItem;
    }); …

我正在传递用户名，API调用的密码返回正确的值。但是在身份验证API返回安全令牌后，我需要捕获令牌并传递用户名和密码。我在下面传递标头值的代码

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
[request setHTTPMethod:[self HTTPMethod]];
[request setHTTPBody:self.requestData];
[request addValue:@"xyz" forHTTPHeaderField:@"username"];
[request addValue:@"xyz" forHTTPHeaderField:@"password"];
[request addValue:[[NSUserDefaults standardUserDefaults]valueForKey:@"Auth"] forHTTPHeaderField:@"Authorization"];
[request addValue:@"application/json" forHTTPHeaderField:@"Content-Type"];

我搜索了标头方法，但没有任何帮助。我在这里做错了什么。请任何人帮助我修复它。谢谢。