UI-json解析ネットワークデータ

//
//  ViewController.m
//      json
//


#import "ViewController.h"

@interface ViewController ()
{
    NSMutableData *_data;
}
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    UIButton *btn = [UIButton buttonWithType:UIButtonTypeSystem];
    btn.frame = CGRectMake(10, 50, 200, 30);
    [btn setTitle:@"    " forState:UIControlStateNormal];
    btn.backgroundColor = [UIColor cyanColor];
    [btn addTarget:self action:@selector(btnClick) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:btn];
    // Do any additional setup after loading the view, typically from a nib.
}

-(void)btnClick
{
    //1.           
 
 NSString * str = @"http://ktx.cms.palmtrends.com/api_v2.php?action=home_list&sa=&uid=10067566&mobile=iphone5&offset=0&count=15&&e=b7849d41b00bbacc9a62544402abed9e&uid=10067566&pid=10053&mobile=iphone5&platform=i";
    //2.
    NSURL *url = [NSURL URLWithString:str];
    
    NSURLRequest *request = [[NSURLRequest alloc]initWithURL:url];
    
    NSURLConnection *connection = [[NSURLConnection alloc]initWithRequest:request delegate:self];
    [connection start];
}

-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    _data = [[NSMutableData alloc]init];
}
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    [_data appendData:data];
}
-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    NSDictionary *JsonDict = [NSJSONSerialization JSONObjectWithData:_data options:NSJSONReadingMutableContainers error:nil];
    NSArray *listArray = [JsonDict objectForKey:@"list"];
    for(NSDictionary *dict in listArray)
    {
        NSString *title = [dict objectForKey:@"title"];
        NSLog(@"%@",title);
    }
    
}
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
    NSLog(@"    ");
}
- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end