Ios Xcode-[[uuuu NSArrayM isEqualToString:]:发送到实例0x7a1248d0的无法识别的选择器-如何修复?
在我展示我的代码之前,请耐心等待,我对stackoverflow和Objective都是新手 当我尝试以下操作时,我的问题出现了:Ios Xcode-[[uuuu NSArrayM isEqualToString:]:发送到实例0x7a1248d0的无法识别的选择器-如何修复?,ios,json,xcode,nsarray,Ios,Json,Xcode,Nsarray,在我展示我的代码之前,请耐心等待,我对stackoverflow和Objective都是新手 当我尝试以下操作时,我的问题出现了: NSLog(@"%@",self.side.article.categories); NSLog(@"%@",side_.article.categories); [NSString stringWithFormat:@"%@",self.side.article.categories]; if ([self.side.article.categories is
NSLog(@"%@",self.side.article.categories);
NSLog(@"%@",side_.article.categories);
[NSString stringWithFormat:@"%@",self.side.article.categories];
if ([self.side.article.categories isEqualToString:@"4"]) { //here
[[IOLSession defaultSession] logEventWithType:IOLEventTypeView
state:IOLViewAppeared
category:@"art_meldungen-des-tages"
comment:nil];}
我尝试的是从JSON获取类别的值:
"articles": [{"id":xxx,"date":xxx,"lastChanged":xxx,"weblink":
"xxx","annotation":"xxx","imageURL": "xxx",
"thumbnailurl": "xxx","categories": [3], ...
现在我如何取它们:
- (void)updateArticlesWithParsedContent:(NSDictionary *)parsedContent
{
NSManagedObjectContext *managedObjectContext = self.managedObjectContext;
NSFetchRequest *existingArticlesFetchRequest = [[[NSFetchRequest alloc] init] autorelease];
existingArticlesFetchRequest.entity = [NSEntityDescription entityForName:@"Article" inManagedObjectContext:managedObjectContext];
NSArray *existingArticlesFetchResult = [managedObjectContext executeFetchRequest:existingArticlesFetchRequest error:NULL];
NSMutableDictionary *existingArticles = [NSMutableDictionary dictionaryWithObjects:existingArticlesFetchResult forKeys:[existingArticlesFetchResult valueForKey:@"articleID"]];
NSMutableSet *articlesInParsedContentSet = [NSMutableSet set];
NSArray *parsedArticles = [parsedContent objectForKey:@"articles"];
for (NSDictionary *parsedArticle in parsedArticles) {
NSNumber *articleID = [parsedArticle objectForKey:@"id"];
Article *article = [existingArticles objectForKey:articleID];
if (!article) {
article = [NSEntityDescription insertNewObjectForEntityForName:@"Article" inManagedObjectContext:managedObjectContext];
article.articleID = articleID;
[existingArticles setObject:article forKey:articleID];
}
[articlesInParsedContentSet addObject:article];
NSDate *parsedLastChanged = [NSDate dateWithTimeIntervalSince1970:[[parsedArticle objectForKey:@"lastChanged"] doubleValue]];
if (!article.lastChanged || ([article.lastChanged compare:parsedLastChanged] == NSOrderedAscending)) {
article.date = [NSDate dateWithTimeIntervalSince1970:[[parsedArticle objectForKey:@"date"] doubleValue]];
article.annotation = [parsedArticle objectForKey:@"annotation"];
article.weblink = [self baselineURLStringAppendedWithString:[parsedArticle valueForKey:@"weblink"]];
article.imageURL = [self baselineURLStringAppendedWithString:[parsedArticle valueForKey:@"imageURL"]];
article.thumbnailURL = [self baselineURLStringAppendedWithString:[parsedArticle valueForKey:@"thumbnailURL"]];
--> article.categories=[parsedArticle objectForKey:@"categories"];
还有我的文章
#import <Foundation/Foundation.h>
#import <CoreData/CoreData.h>
@class Side;
@interface Article : NSManagedObject
@property (nonatomic, retain) NSString * annotation;
@property (nonatomic, retain) NSNumber * articleID;
@property (nonatomic, retain) NSDate * date;
@property (nonatomic, retain) NSString * imageURL;
@property (nonatomic, retain) NSDate * lastChanged;
@property (nonatomic, retain) NSString * thumbnailURL;
@property (nonatomic, retain) NSString * weblink;
@property (nonatomic, retain) NSNumber * hasBeenRead;
@property (nonatomic, retain) NSSet *sides;
@property (nonatomic, retain) NSString *categories;
@end
@interface Article (CoreDataGeneratedAccessors)
- (void)addSidesObject:(Side *)value;
- (void)removeSidesObject:(Side *)value;
- (void)addSides:(NSSet *)values;
- (void)removeSides:(NSSet *)values;
@end
我刚刚得到:lldb EXT\u BAD\u访问代码=2,地址=0x4
PS:我还更改了@property非原子,保留NSString*类别;若要@property nonatomic,请保留NSNumber*categories
解决办法是:
if ([NSString stringWithFormat:@"%@", [self.side.article.categories objectAtIndex:0]] isEqual:@"4") {...
类别对象属于数组类型。因此,您需要从数组中获取对象。类别对象不是NSString类型。您应该将代码用作:
[NSString stringWithFormat:@"%@", [self.side.article.categories objectAtIndex:0]];
正如@Unnati所说,在JSON中,categories对象不是字符串。对象文章模型中的类别类型错误。类别似乎包含数组对象。尝试使用objectAtIndex.categories:[3]尝试使用objectAtIndex和数字值而不是字符串值我将类别的类型更改为NSNumber,现在我只得到lldb EXT_BAD_ACCESS Code=2,Adress=0x4Categories是一个NSArray,[categories objectAtIndex[i]]返回一个NSInteger值而不是NSString,如@Huy Nghia在评论中所说的。ok,我先到dump去了解,但这解决了我的问题:我做到了:如果[nsstringwithformat:@%@[self.side.article.categories objectAtIndex:0]]isEqual:@4{。。。
[NSString stringWithFormat:@"%@", [self.side.article.categories objectAtIndex:0]];