[英]How to parse JSON and have 2 final arrays of data
我正在使用JSON解析itunes rss feed,但是遇到了问题。 以下代码对于movieName输出之一正常运行,但是我仍未获得movieSummary输出。
-(void)connectionDidFinishLoading:(NSURLConnection *)connection {
allDataDictionary = [NSJSONSerialization JSONObjectWithData:webData options:0 error:nil];
feed = [allDataDictionary objectForKey:@"feed"];
arrayOfEntry = [feed objectForKey:@"entry"];
for (NSDictionary *dictionTitle in arrayOfEntry) {
NSDictionary *title = [dictionTitle objectForKey:@"title"];
NSString *labelTitle = [title objectForKey:@"label"];
[arrayLable addObject:labelTitle];
NSDictionary *summary = [dictionTitle objectForKey:@"summary"];
NSString *labelSummary = [summary objectForKey:@"label"];
[arraySummary addObject:labelSummary];
}
movieName.text = [arrayLable objectAtIndex:0];
movieSummary.text = [arraySummary objectAtIndex:0]; //This is not displaying
}
这是我正在解析的链接: http : //itunes.apple.com/us/rss/topmovies/limit=300/json
问题是当我将字符串添加到Array时,它有时包含NULL,因此以下代码帮助了我
if ([[arrayName objectAtIndex:0] isKindOfClass:[NSNull class]]) {
labelName.text = @"This is NULL";
} else {
[arrayName addObject:labelName];
}
if ([[arraySummary objectAtIndex:0] isKindOfClass:[NSNull class]]) {
labelSummary.text = @"This is NULL";
} else {
[arraySummary addObject:labelSummary];
}
我经常遇到这种情况。 我用这样的东西。 替换您的代码
NSString *labelTitle = [title objectForKey:@"label"];
[arrayLable addObject:labelTitle];
与
NSString * labelTitle = [ [ title objectForKey:@"label" ] ifNullThenNil ] ;
[ arrayLabel addObject:labelTitle ? labelTitle : @"" ] ; // you could also use @"<unknown>" or similar instead of @""
其中-ifNullThenNil
通过类别提供:
@implementation NSObject (IfNullThenNil)
-(id)ifNullThenNil { return self ; }
@end
@implementation NSNull (IfNullThenNil)
-(id)ifNullThenNil { return nil ; }
@end
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