【OC】当前版本和appStore版本比较

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/// 判断是否最新版本号（大于或等于为最新）
- (BOOL)isLastestVersion:(NSString *)currentVersion compare:(NSString *)lastestVersion {
    if (currentVersion && lastestVersion) {
        // 拆分成数组
        NSMutableArray *currentItems = [[currentVersion componentsSeparatedByString:@"."] mutableCopy];
        NSMutableArray *lastestItems = [[lastestVersion componentsSeparatedByString:@"."] mutableCopy];
        // 如果数量不一样补0
        NSInteger currentCount = currentItems.count;
        NSInteger lastestCount = lastestItems.count;
        if (currentCount != lastestCount) {
            NSInteger count = labs(currentCount - lastestCount); // 取绝对值
            for (int i = 0; i < count; ++i) {
                if (currentCount > lastestCount) {
                    [lastestItems addObject:@"0"];
                } else {
                    [currentItems addObject:@"0"];
                }
            }
        }
        // 依次比较
        BOOL isLastest = YES;
        for (int i = 0; i < currentItems.count; ++i) {
            NSString *currentItem = currentItems[i];
            NSString *lastestItem = lastestItems[i];
            if (currentItem.integerValue != lastestItem.integerValue) {
                isLastest = currentItem.integerValue > lastestItem.integerValue;
                break;
            }
        }
        return isLastest;
    }
    return NO;
}