iOS关于版本更新的问题

// 获取app版本
    NSString *app_Version = [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleShortVersionString"];

版本号判断方法：

//输出YES（服务器大与本地） 输出NO（服务器小于本地）
- (BOOL)compareEditionNumber:(NSString *)serverNumberStr localNumber:(NSString*)localNumberStr {
    //剔除版本号字符串中的点
     serverNumberStr = [serverNumberStr stringByReplacingOccurrencesOfString:@"." withString:@""];
     localNumberStr = [localNumberStr stringByReplacingOccurrencesOfString:@"." withString:@""];
    //计算版本号位数差
    int placeMistake = (int)(serverNumberStr.length-localNumberStr.length);
    //根据placeMistake的绝对值判断两个版本号是否位数相等
    if (abs(placeMistake) == 0) {
        //位数相等
        return [serverNumberStr integerValue] > [localNumberStr integerValue];
    }else {
        //位数不等
        //multipleMistake差的倍数
        NSInteger multipleMistake = pow(10, abs(placeMistake));
        NSInteger server = [serverNumberStr integerValue];
        NSInteger local = [localNumberStr integerValue];
        if (server > local) {
            return server > local * multipleMistake;
        }else {
            return server * multipleMistake > local;
        }
    }
}

代码跳转AppStore：

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"app路径链接"]];