uiactionsheet的背景颜色

Question

我尝试更改动作表的背景颜色,我只是使用方法:

[actionSheet setBackgroundColor:[UIColor colorWithRed:30 green:30 blue:30 alpha:0.5]];

我把它放在willPresentActionSheet中.但背景颜色不变,为什么？

Answer 1

• 添加QuartzCore.framework
• 为您的操作表设置委托
• 设置动作表的样式:UIActionSheetStyleBlackTranslucent
• 覆盖方法willPresentActionSheet

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

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

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