如何正确设置UIView的alpha？[iOS的]

Question

我有UIView很多子视图(UILabel,UITextView等).

如果设置alpha 0.6到主视图所有子视图都采用此alpha.

如何分别设置主视图的alpha？

Answer 1

 [view setBackgroundColor:[[UIColor clearColor] colorWithAlphaComponent:0.5]];

 //try this.. dont try to set alpha of UIView and also your subviews will not affect