iOS程序自動檢測AppStore更新的實現

.h文件中

<UIAlertViewDelegate>

.m文件中

#import "SBJson.h"        //解析sbjson 數據

- (void)viewDidLoad
{
    [super viewDidLoad];
    
      ⋯⋯    
    
    [self checkVersion];   //檢測升級

}

#pragma mark - 實現升級功能

//檢測軟件是否需要升級
-(void)checkVersion
{
    NSString *newVersion;
    NSURL *url = [NSURL URLWithString:@"http://itunes.apple.com/cn/lookup?id=692579125"];
    
    //通過url獲取數據
    NSString *jsonResponseString =   [NSString stringWithContentsOfURL:url encoding:NSUTF8StringEncoding error:nil];
    NSLog(@"通過appStore獲取的數據是：%@",jsonResponseString);
    
    //解析json數據爲數據字典
    NSDictionary *loginAuthenticationResponse = [self dictionaryFromJsonFormatOriginalData:jsonResponseString];
    
    //從數據字典中檢出版本號數據
    NSArray *configData = [loginAuthenticationResponse valueForKey:@"results"];
    for(id config in configData) 
    {
        newVersion = [config valueForKey:@"version"];
    }
    
    NSLog(@"通過appStore獲取的版本號是：%@",newVersion);
    
    //獲取本地軟件的版本號
    NSString *localVersion = [[[NSBundle mainBundle]infoDictionary] objectForKey:@"CFBundleVersion"];
    
    NSString *msg = [NSString stringWithFormat:@"你當前的版本是V%@，發現新版本V%@，是否下載新版本？",localVersion,newVersion];
    
    //對比發現的新版本和本地的版本
    if ([newVersion floatValue] > [localVersion floatValue])
    {
        UIAlertView *createUserResponseAlert = [[UIAlertView alloc] initWithTitle:@"升級提示!" message:msg delegate:self cancelButtonTitle:@"下次再說" otherButtonTitles: @"現在升級", nil];
        [createUserResponseAlert show];   
        [createUserResponseAlert release];  
    }
}

//響應升級提示按鈕
- (void)alertView:(UIAlertView *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {  
    //如果選擇“現在升級” 
    if (buttonIndex == 1)  
    {  
        //打開iTunes  方法一
        [[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"https://itunes.apple.com/cn/app/wan-zhuan-quan-cheng/id692579125?mt=8"]];
        
        /*
         // 打開iTunes 方法二:此方法總是提示“無法連接到itunes”，不推薦使用
         NSString *iTunesLink = @"itms-apps://phobos.apple.com/WebObjects/MZStore.woa/wa/viewSoftwareUpdate?id=692579125&mt=8";  
         [[UIApplication sharedApplication] openURL:[NSURL URLWithString:iTunesLink]];  
         */
    }  
} 

#pragma mark - 輔助方法：將json 格式的原始數據轉解析成數據字典
//將json 格式的原始數據轉解析成數據字典
-(NSMutableDictionary *)dictionaryFromJsonFormatOriginalData:(NSString *)str
{
    SBJsonParser *sbJsonParser = [[SBJsonParser alloc]init];
    NSError *error = nil;
    
    //添加autorelease 解決 內存泄漏問題
    NSMutableDictionary *tempDictionary = [[[NSMutableDictionary alloc]initWithDictionary:[sbJsonParser objectWithString:str error:&error]]autorelease];
    return tempDictionary;
}