prepareForSegue 推送到 UIWebView

Question

我有一个包含各种单元格的 CollectionViewController。每次单击单元格时，我都想将其推送到其中带有 UIWebView 的视图。每个单元格都有不同的 URL。

我已设法使代码正常工作，但出现此错误：不兼容的指针类型将“NSURL *”发送到“NSString *”类型的参数

Article.h

@interface Article : NSObject

@property (nonatomic, strong) NSURL *url;

- (instancetype)initWithAttributes:(NSDictionary *)attributes;

+ (void)articlesWithBlock:(void (^)(NSArray *articles, NSError *error))block;

@end

Article.m

@implementation Article

- (instancetype)initWithAttributes:(NSDictionary *)attributes {
    self = [super init];
    if (!self) {
        return nil;
    }

    self.url = attributes[@"url"];

    return self;
}

+ (void)articlesWithBlock:(void (^)(NSArray *articles, NSError *error))block {
    [[DeadstockAPIManager sharedManager] GET:@"articles" parameters:nil success:^(AFHTTPRequestOperation *operation, id JSON) {
        NSMutableArray *mutableArticles = [NSMutableArray array];
        for (NSDictionary *attributes in JSON[@"articles"]) {
            Article *article = [[Article alloc] initWithAttributes:attributes];
            [mutableArticles addObject:article];
        }
        if (block) {
            block([NSArray arrayWithArray:mutableArticles], nil);
        }
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        if (block) {
            block(nil, error);
        }
    }];
}

@end

CollectionViewController

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    if ([segue.identifier isEqualToString:@"showArticle"]) {
        NSIndexPath *selectedIndexPath = [[self.collectionView indexPathsForSelectedItems] lastObject];
        Article *article = [self releaseForIndexPath:selectedIndexPath];
        ArticleViewController *articleViewController = (ArticleViewController *)segue.destinationViewController;
        articleViewController.articleURL = article.url;
    }
}

视图控制器

@property (nonatomic, strong) NSURL *articleURL;

@property (nonatomic, strong) IBOutlet UIWebView *webView;

- (void)viewDidLoad {
    [super viewDidLoad];

    NSURL *url = [NSURL URLWithString:self.articleURL]; **// This is where I get the error**
    NSURLRequest *urlRequest = [NSURLRequest requestWithURL:url];
    [self.webView loadRequest:urlRequest];
}

还有其他方法可以实现我想要的吗？谢谢。

Answer 1

只需像这样修改您的代码：

- (void)viewDidLoad {
    [super viewDidLoad];

    NSURLRequest *urlRequest = [NSURLRequest requestWithURL:self.articleURL];
    [self.webView loadRequest:urlRequest];
}

articleURL 已经是NSURL 类型，因此无需调用NSURL *url = [NSURL URLWithString:self.articleURL];。

更新： 您似乎将NSString 放入Article 的url 属性中。

在Article.m 中尝试以下操作：

- (instancetype)initWithAttributes:(NSDictionary *)attributes {
    self = [super init];
    if (!self) {
        return nil;
    }
    NSString *urlString = attributes[@"url"]; // first get the URL as a string from attributes
    self.url = [NSURL URLWithString:urlString]; // then assign it to property of type NSURL

    return self;
}