解析Json解析的代碼如何？

Question

您好我已經實現代碼解析如下回應如下，但它不能正常工作：

NSString *req = [NSString stringWithFormat: @" My URL"]; 
NSDictionary *googleResponse = [[NSString stringWithContentsOfURL: [NSURL URLWithString: req] encoding: NSUTF8StringEncoding error: NULL] JSONValue];   
NSDictionary *resultsDict = [googleResponse valueForKey: @"eventtitle"]; 

什麼是解析響應以下的代碼？請給我解決方案。

{ 
    "AlansHarleyEvents": [ 
    { 
     "id": "3", 
     "eventtitle": "22nd Annual Pig Roast", 
     "eventdate": "April 22nd 8am-5pm" 
    }, 
    { 
     "id": "4", 
     "eventtitle": "Poker Run", 
     "eventdate": "April 28th 8am at Shooters" 
    }, 
    { 
     "id": "5", 
     "eventtitle": "Kickstands for kids", 
     "eventdate": "May 12th 8am-5pm" 
    }, 
    { 
     "id": "6", 
     "eventtitle": "Ride for the Cure", 
     "eventdate": "May28th 8am Free Drinks!" 
    }, 
    { 
     "id": "7", 
     "eventtitle": "Veterans Ride", 
     "eventdate": "June 10th 9am @City Hall" 
    }, 
    { 
     "id": "8", 
     "eventtitle": "Biker Beach Bash", 
     "eventdate": "June 28th 8-5pm @ The Pier" 
    }, 
    { 
     "id": "10", 
     "eventtitle": "22nd Annual Pig Roast", 
     "eventdate": "April 22nd 8am-5pm" 
    }, 
    { 
     "id": "11", 
     "eventtitle": "Poker Run", 
     "eventdate": "April 28th 8am at Shooters Lounge" 
    }, 
    { 
     "id": "12", 
     "eventtitle": "22nd Annual Pig Roast", 
     "eventdate": "April 22nd 8am-5pm" 
    }, 
    { 
     "id": "13", 
     "eventtitle": "Swamp Run", 
     "eventdate": "April 22nd 8am-5pm" 
    } 
    ] 
} 

Answer 1

如果您resultsDict包含上述JSON那麼你可以解析它：

NSString *req = [NSString stringWithFormat: @" My URL"]; 
NSDictionary *googleResponse = [[NSString stringWithContentsOfURL: [NSURL URLWithString: req] encoding: NSUTF8StringEncoding error: NULL] JSONValue]; 
NSDictionary *resultsDict = [googleResponse valueForKey: @"eventtitle"]; 

NSMutableArray *resultArray = [resultsDict valueForKey:@"AlansHarleyEvents"]; 

for(int i = 0; i<[resultArray count]; i++) 
{ 
    NSLog(@"%@",[[resultArray objectAtIndex:i] valueForKey:@"id"]) ; 
    NSLog(@"%@",[[resultArray objectAtIndex:i] valueForKey:@"eventtitle"]) ; 
    NSLog(@"%@",[[resultArray objectAtIndex:i] valueForKey:@"eventdate"]) ; 
} 

Answer 2

NSJSONSerialization類是本地班的iOS 5及以上 http://developer.apple.com/library/ios/#documentation/Foundation/Reference/NSJSONSerialization_Class/Reference/Reference.html

對於任何iPhone OS版本，意味着你可以去JSONKit： https://github.com/johnezang/JSONKit

Answer 3

Yu可以使用NSJSONSerialization對象與IOS 5

NSDictionnary *jsonObject = [NSJSONSerialization JSONObjectWithData:resultsDict options:NSJSONReadingMutableContainers error:&error];