iOS - 项目中App版本更新逻辑 , 操作

//1.获取上次登录版本号
NSString *lastVersion = [[NSUserDefaults standardUserDefaults]objectForKey:@"lastVersion"];

//2.获取当前登录版本号
NSString *currentVersion =  [[NSBundle mainBundle]infoDictionary][@"CFBundleShortVersion"]; //也可自行在info.plist中添加键值对 ,key可自拟

//3.版本对比
//基本情况就是 , 现在版本高于之前版本 ,那么可以展示一些新版本特性
if (![currentVersion isEqualToString:lastVersion]) {

//此处可做逻辑操作 , 比如引导页 ?

}else{

//逻辑操作
}

//4. 获取最新版本 , 两种方式

//方式一: 通过后台服务器返回版本号

//此方法不是很好 , 第一是需要后台人员维护 , 及时更新 . 第二是在app版本更新上架期间 , 所有用户根据提示更新到的app相当于全是落后一个版本的.

//假设后台版本接口为  www.baidu.com/host/AppVersion
//此处使用原生请求 , 项目中当时使用AFN或者封装好的请求即可.

NSString *urlString = @"www.baidu.com/host/AppVersion";
//转义
urlString = [urlString stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];

NSURL *url = [NSURL URLWithString:urlString];

NSURLRequest *request = [NSURLRequest requestWithURL:url];

NSURLSession *session = [NSURLSession sharedSession];

[[session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {

//解析json
NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:0 error:NULL];
//假设键为 version
NSString *newVersion = dict[@"version"];

//判断如果用户使用版本 低于最新版本 , 那么提示用户进行更新
if (currentVersion.floatValue < newVersion.floatValue) {

//弹出提示框更新版本
[self alertShowWithTips:newVersion];
}
}]resume];

//方法二 :

//假设你的appid是 12345
NSInteger appid = 12345;
NSString *urlString = [NSString stringWithFormat:@"http://itunes.apple.com/cn/lookup?id=%li",appid];
urlString = [urlString stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];
NSURL *url = [NSURL URLWithString:urlString];

NSURLSession *session = [NSURLSession sharedSession];
[session dataTaskWithURL:url completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {

NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:nil error:NULL];

//获取版本号
//返回 version键对应的值
NSString *newVersion = [dict[@"results"]firstObject][@"version"];
//对比版本号
if (newVersion.floatValue > currentVersion.floatValue) {

//弹出框
[self alertShowWithTips:newVersion];
}

}];
//    NSString *newVersion = [NSString]

//返回值截取
/*
{
resultCount = 1;
results =     (
{
artistId = 开发者 ID;
artistName = 开发者名称;
price = 0;
isGameCenterEnabled = 0;
kind = software;
languageCodesISO2A =             (
EN
);
trackCensoredName = 审查名称;
trackContentRating = 评级;
trackId = 应用程序 ID;
trackName = 应用程序名称";
trackViewUrl = 应用程序介绍网址;
userRatingCount = 用户评级;
userRatingCountForCurrentVersion = 1;
version = 版本号;
wrapperType = software;
}
);
}

*/

- (void)alertShowWithTips:(NSString *)newVersion
{
UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"温馨提示" message:@"该App有新版本" preferredStyle:UIAlertControllerStyleActionSheet];

UIAlertAction *actionOne = [UIAlertAction actionWithTitle:@"忽略" style:UIAlertActionStyleDefault handler:nil];
UIAlertAction *actionTwo = [UIAlertAction actionWithTitle:@"前往前往更新" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {

//该app在appStore中的地址  例如 :https://itunes.apple.com/....123213

NSURL *url = [NSURL URLWithString:@"https://itunes.apple.com/....123213"];

//前往苹果商店更新
[[UIApplication sharedApplication]openURL:url options:@{} completionHandler:nil];

//5 .更新本地存储版本号

[[NSUserDefaults standardUserDefaults]setObject:newVersion forKey:@"lastVersion"];
[[NSUserDefaults standardUserDefaults]synchronize];

}
}];

[alert addAction:actionOne];
[alert addAction:actionTwo];
[self presentViewController:alert animated:YES completion:nil];
}