IOS版本更新代码——商店版本

-(void)checkAppUpdate
{
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
NSDictionary *infoDict = [[NSBundle mainBundle] infoDictionary];

NSString *nowVersion = [infoDict objectForKey:@"CFBundleVersion"];
NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"http://itunes.apple.com/lookup?id=%@", kStoreAppId]];

NSString * file =  [NSString stringWithContentsOfURL:url encoding:NSUTF8StringEncoding error:nil];
NSLog(@"%@",file);
dispatch_async(dispatch_get_main_queue(), ^{
NSData *data = [file dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];
if(((NSArray*)dic[@"results"]).count>0)
{

NSString *newVersion = [NSString stringWithFormat:@"%@",dic[@"results"][0][@"version"]];

NSString *nowVersion2 = [nowVersion stringByReplacingOccurrencesOfString:@"." withString:@""];
NSString *newVersion2 = [newVersion stringByReplacingOccurrencesOfString:@"." withString:@""];

if([newVersion2 intValue]>[nowVersion2 intValue])
{
NSString *newMsg = [NSString stringWithFormat:@"%@",dic[@"results"][0][@"releaseNotes"]];
NSString *newstr = [NSString stringWithFormat:@"有新版V%@",newVersion];
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:newstr message:newMsg delegate:self cancelButtonTitle:@"取消"otherButtonTitles:@"更新",nil];
[alert show];
}
}
});
});
}

- (void)alertView:(UIAlertView*)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
if(buttonIndex==1)
{
// 此处加入应用在app store的地址，方便用户去更新，一种实现方式如下：
NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"https://itunes.apple.com/us/app/id%@?ls=1&mt=8", kStoreAppId]];
[[UIApplication sharedApplication] openURL:url];
}
}