Question

我在iOS应用中使用Facebook v4 SDK。为了获得相关信息，我经常使用[FBSDKProfile currentProfile]单身人士。但是，我还需要随时可以访问配置文件图像，因此写了一个类别来接受这个。

这是头文件：

#import <FBSDKCoreKit/FBSDKCoreKit.h>

@interface FBSDKProfile (ProfileImage)

+(void)fetchProfileImageWithBlock:(void (^)(BOOL succeeded))handler;

@property (nonatomic, strong, readonly) UIImage *profileImage;

@end

这是实施文件：

#import "FBSDKProfile+ProfileImage.h"

@interface FBSDKProfile()

@property (nonatomic, strong, readwrite) UIImage *profileImage;

@end

@implementation FBSDKProfile (ProfileImage)

+(void)fetchProfileImageWithBlock:(void (^)(BOOL succeeded))handler {
    FBSDKProfile *currentProfile = [FBSDKProfile currentProfile];
    NSString *userId = currentProfile.userID;
    if (![userId isEqualToString:@""] && userId != Nil)
    {
        [self downloadFacebookProfileImageWithId:userId completionBlock:^(BOOL succeeded, UIImage *profileImage) {
            currentProfile.profileImage = profileImage;
            if (handler) { handler(succeeded); }
        }];
    } else
    {
        /* no user id */
        if (handler) { handler(NO); }
    }
}

+(void)downloadFacebookProfileImageWithId:(NSString *)profileId completionBlock:(void (^)(BOOL succeeded, UIImage *profileImage))completionBlock
{
    NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"https://graph.facebook.com/%@/picture?type=large", profileId]];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    [NSURLConnection sendAsynchronousRequest:request
                                   queue:[NSOperationQueue mainQueue]
                       completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {
                               if (!error)
                               {
                                   UIImage *image = [[UIImage alloc] initWithData:data];
                                   completionBlock(YES, image);
                               } else{
                                   completionBlock(NO, nil);
                               }
                           }];
}

@end

但是，我得到了这个例外：

由于未捕获的异常终止应用＆＃39; NSInvalidArgumentException＆＃39;，原因：＆＃39; - [FBSDKProfile setProfileImage：]：无法识别的选择器已发送到实例

为什么会这样？

Answer 1

你可以使用，

public ContactViewModel(ObservableCollection<Room> room)
{            
   // Initialize dropdown data for titlelist
   DropDownTitle = GenerateDropDownDataForTitle();
   DropDownCountry = GenerateDropDownDataForCountry();
   ContactModel = new ContactDetails(1, "", "", "", "", 1);
   // Initialize commands
   BookCommand = new RelayCommand(BookCommand_DoWork, () => true);
   BackCommand = new RelayCommand(BackCommand_DoWork, () => true);
   if (room != null)
   {
       SelectedRooms = room;
   }
}

请参阅this link了解详情。

Answer 2

<强>问题

您已将属性readonly添加到您的媒体资源profileImage。它意味着什么：

你可以只读，所以调用setter会抛出异常。

<强>解决方案

不要将readonly属性分配给profileImage

@property (nonatomic, strong) UIImage *profileImage;

无法识别的选择器发送到FBSDKProfile类别上的实例

2 个答案: