iOS 检测版本更新、并跳转AppStore

有些App更新新功能并且上线后，会有这样的需求：用户登录后，会提示用户“发现新版本，请更新”，这就需要用户点击确定后，跳转AppStore下载。以下是我的实现方法：

原理：

每个上架的苹果应用程序，都会有一个应用程序的ID。根据这个ID我们就可以获取到当前程序的最新版本号，然后和自己的版本号作比较，如果一样的话就是最新版，反之就不是新版。然后就可以提示用户来手动下载最新版的程序。

1、获当前版本号

NSDictionary *infoDic = [[NSBundle mainBundle] infoDictionary];

NSString *currentVersion = infoDic[@"CFBundleShortVersionString"];

NSLog(@"【1】当前为自动检测检测,当前版本号为:%@",currentVersion);

2、链接Itunes获取应用商店版本号

NSError*error;

NSData*response = [NSURLConnectionsendSynchronousRequest:[NSURLRequestrequestWithURL:[NSURLURLWithString:[NSStringstringWithFormat:@"http://itunes.apple.com/cn/lookup?id=%@",你的AppID]]]returningResponse:nilerror:nil];

NSDictionary *appInfoDic = [NSJSONSerialization JSONObjectWithData:response options:NSJSONReadingMutableLeaves error:&error];

NSLog(@"可输出一下看看%@",appInfoDic);

NSArray *array = appInfoDic[@"results"];

if(array.count < 1) {

NSLog(@"此APPID为未上架的APP或者查询不到");

return;

}

NSDictionary*dic = array[0];

//AppStore版本号

NSString*appStoreVersion = dic[@"version"];

NSLog(@"当前版本号:%@---商店版本号:%@",currentVersion,appStoreVersion);

3、比较版本号,当前版本号 < AppStore版本号  提示更新

currentVersion = [currentVersion stringByReplacingOccurrencesOfString:@"."withString:@""];

if(currentVersion.length == 2) {

currentVersion =  [currentVersion stringByAppendingString:@"0"];

}else if (currentVersion.length==1){

currentVersion =  [currentVersion stringByAppendingString:@"00"];

}

appStoreVersion = [appStoreVersion stringByReplacingOccurrencesOfString:@"."withString:@""];

if(appStoreVersion.length == 2) {

appStoreVersion = [appStoreVersion stringByAppendingString:@"0"];

}elseif(appStoreVersion.length ==1){

appStoreVersion= [appStoreVersion stringByAppendingString:@"00"];

}

4、比较版本，然后更新

if([currentVersion floatValue] < [appStoreVersion floatValue]) {

UIAlertController *alertC = [UIAlertController alertControllerWithTitle:@"版本有更新"message:[NSString stringWithFormat:@"检测到新版本(%@),是否更新?",dic[@"version"]]preferredStyle:UIAlertControllerStyleAlert];

UIAlertAction*sureAction = [UIAlertActionactionWithTitle:@"更新"style:UIAlertActionStyleDefaulthandler:^(UIAlertAction*_Nonnullaction){

NSURL*url = [NSURL URLWithString:[NSString stringWithFormat:@"https://itunes.apple.com/us/app/id%@?ls=1&mt=8",你的AppID]];

[[UIApplicationsharedApplication]openURL:url];

}];

UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancelhandler:nil];

[alertCaddAction:sureAction];

[alertCaddAction:cancelAction];

[selfpresentViewController:alertCanimated:YEScompletion:nil];

}