1 YYKIt+UIDevice的方法

NSString *platformstr = [[UIDevice currentDevice] machineModelName];
    if ([platformstr isEqualToString:@"iPhone XR"]||
        [platformstr isEqualToString:@"iPhone XS Max"]||
        [platformstr isEqualToString:@"iPhone XS"]||
        [platformstr isEqualToString:@"iPhone X"]) {
        buyButton.frame = CGRectMake(0, KScreenH-50, KScreenW, 50);
    }