这是我用来从json框架创建轮询数据的代码。但是,每次我启动该应用程序时,它都会崩溃。有什么建议吗?
-(void)connectionDidFinishLoading:(NSURLConnection *)connection {
NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
self.responseData = nil;
NSArray *latestEvent = [(NSDictionary*)[responseString JSONValue] objectForKey:@"Events"];
[responseString release];
//Choose event
NSDictionary *flashMob = [latestEvent objectAtIndex:0];
//Fetch the Data
NSString *name = [flashMob objectForKey:@"event"];
NSDate *eDate = [flashMob objectForKey:@"date"];
NSString *location = [flashMob objectForKey:@"location"];
NSString *danceVid = [flashMob objectForKey:@"dancevideo"];
//Set the text to the label
label.text = [NSString stringWithFormat:@"Next Flash Mob is: %@, on %@, near %@, with Dance: %@", name, eDate, location, danceVid];
}
Json是:
{ "Events":[{"id":0001,"event":"Party Rock Anthem Flash Mob","date":"12/18/2011",
"dancevideo":"http://www.youtube.com/watch?v=dP2ddTuMKIg","Location":"Flatirons Crossing, Broomfield, CO"}]
}
编辑我还将包括viewDidLoad方法,除非调用可能失败。
- (void)viewDidLoad
{
[super viewDidLoad];
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.corliosity.com/denverflash.json"]];
[[NSURLConnection alloc] initWithRequest:request delegate:self];
responseData = [[NSMutableData data] retain];
// Do any additional setup after loading the view from its nib.
}
最佳答案
在下面尝试此代码
-(void)connectionDidFinishLoading:(NSURLConnection *)connection {
// try this code here
NSDictionary *JSONDictionary = [[[[SBJsonParser alloc] init] autorelease] objectWithData:responseData];
[self.responseData release] // only if is retained by your class.
self.resposeDate = nil;
NSArray *latestEvent = [JSONDictionary valueForKey:@"Events"];
[responseString release];
//Choose event
NSDictionary *flashMob = [latestEvent objectAtIndex:0];
//Fetch the Data
NSString *name = [flashMob objectForKey:@"event"];
NSDate *eDate = [flashMob objectForKey:@"date"];
NSString *location = [flashMob objectForKey:@"location"];
NSString *danceVid = [flashMob objectForKey:@"dancevideo"];
//Set the text to the label
label.text = [NSString stringWithFormat:@"Next Flash Mob is: %@, on %@, near %@, with Dance: %@", name, eDate, location, danceVid];
}
现在,您应该在JSONDictionary中看到Events键,相应的对象应该是字典数组。
以您喜欢的方式处理它。
关于iphone - 使用JSON框架时应用崩溃,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/8437630/