background color of uiactionsheet [duplicate]

This question already has answers here: iPhone development: How to create colored or translucent background for UIActionSheet? (6 answers) Closed 3 years ago.

I try to change the background color of my actionsheet, I just use the method:

[actionSheet setBackgroundCol开发者_如何学Pythonor:[UIColor colorWithRed:30 green:30 blue:30 alpha:0.5]];

and I put it in the willPresentActionSheet. But the background color don't change, why?

---

• add QuartzCore.framework
• set delegate for your actionsheet
• set style for actionsheet: UIActionSheetStyleBlackTranslucent
• override method willPresentActionSheet

#import "QuartzCore/QuartzCore.h"
...

yourActionSheet.delegate = self;
yourActionSheet.actionSheetStyle = UIActionSheetStyleBlackTranslucent;
...

- (void)willPresentActionSheet:(UIActionSheet *)actionSheet {
    [[actionSheet layer] setBackgroundColor:[UIColor redColor].CGColor];
}