UIActionsheet背景清除颜色

Question

这里有一个自定义元素的操作表。现在，我需要动作片清晰颜色的背景，或者它应该像镜子一样工作。任何想法 ？ plz帮助。但目前它正在回归浅灰色。我该怎么办？

-(void)chooseCountry 
{ 

UIActionSheet *actionSheet =[[UIActionSheet alloc]initWithTitle:@"Select Country" delegate:self cancelButtonTitle:nil destructiveButtonTitle:nil otherButtonTitles: nil]; 

countryActionSheet=actionSheet; 
actionSheet.backgroundColor=[UIColor clearColor]; 
actionSheet.actionSheetStyle= UIActionSheetStyleDefault; 
countryPicker.dataSource=self; 
countryPicker.delegate=self; 

UIPickerView *pickerView=[[UIPickerView alloc]initWithFrame:CGRectMake(0, 40, 320, 300)]; 
pickerView.delegate=self; 
pickerView.dataSource=self; 
countryPicker=pickerView; 

UIButton *cancelBtn=[[UIButton alloc]initWithFrame:CGRectMake(200,20, 80, 30)]; 
[cancelBtn setTitle:@"Cancel" forState:UIControlStateNormal]; 
[cancelBtn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal]; 
[cancelBtn addTarget:self action:@selector(cancelBtnPressed) forControlEvents:UIControlEventTouchUpInside]; 
[cancelBtn setBackgroundImage:[UIImage imageNamed:@"Untitled 4.png"] forState:UIControlStateNormal]; 

UIButton *okBtn =[[UIButton alloc]initWithFrame:CGRectMake(40, 20, 80, 30)]; 
[okBtn setTitle:@"Done" forState:UIControlStateNormal]; 
[okBtn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal]; 
[okBtn addTarget:self action:@selector(okBtnPressed) forControlEvents:UIControlEventTouchUpInside]; 
[okBtn setBackgroundImage:[UIImage imageNamed:@"Untitled 4.png"] forState:UIControlStateNormal]; 



countryActionSheet.backgroundColor=[UIColor clearColor]; 
//[countryActionSheet addSubview:imageView]; 
[countryActionSheet addSubview:cancelBtn]; 
[countryActionSheet addSubview:okBtn]; 

[countryActionSheet addSubview:countryPicker]; 
[countryActionSheet showInView:self.view]; 
[countryActionSheet setBounds:CGRectMake(0, 0, 320, 400)]; 

}

上面显示的是actionsheet的形象我得到。

Answer 1

我通常实现以下代理方法：

-add QuartzCore.framework。
您actionsheet
-set风格actionsheet -set代表：UIActionSheetStyleBlackTranslucent
-override方法willPresentActionSheet

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

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


- (void)willPresentActionSheet:(UIActionSheet *)actionSheet 
//Just to make a sample. In this case I use a stretched png as a background: 

- (void)willPresentActionSheet:(UIActionSheet *)actionSheet { 

CGSize mySize = myActionSheet.bounds.size; 
CGRect myRect = CGRectMake(0, 0, mySize.width, mySize.height); 
UIImageView *redView = [[[UIImageView alloc] initWithFrame:myRect] autorelease]; 
[redView setBackgroundColor:[UIColor colorWithRed:1.0 green:0.0 blue:0.0 alpha:0.5]]; 
[myActionSheet insertSubview:redView atIndex:0]; 
}