HarmonyOS 有没有设置颜色透明度的方法

(UIView *)backgroundImageViewMask{ 
if(!_backgroundImageViewMask){ 
CGRect frame = CGRectMake(O,0, kAppScreenWidth, kAppScreenHeight - kADLiveToolBarHeight); 
_backgroundImageViewMask = [[UIView alloc]initWithFrame:frame]; 
backaroundImageViewMask.hidden = YES: 
_backgroundImageViewMask.backgroundColor =	[UIColor colorFromString:@"#000000" alpha:0.2]; 
I 
return	_backgroundImageViewMask;