如何自定义UIActionSheet（UIAlertView）中的内容

UIActionSheet和UIAlertView因为UI有特殊的用途，所以本身并不允许你AddSubview之类的函数来自定义界面。解决的办法是继承它，实现一个自定义类，重载layoutSubviews函数

//.h
#import <UIKit/UIKit.h>

@interface UIImageActionSheet : UIActionSheet {
    UIImage *titleImage;
}
-(id) initWithImage:(UIImage *)image 
              title:(NSString *)title 
           delegate:(id <UIActionSheetDelegate>)delegate 
  cancelButtonTitle:(NSString *)cancelButtonTitle 
destructiveButtonTitle:(NSString *)destructiveButtonTitle 
  otherButtonTitles:(NSString *)otherButtonTitles;

@end 

//.m file

#import "UIImageActionSheet.h"





@implementation UIImageActionSheet

-(id) initWithImage:(UIImage *)image 

              title:(NSString *)title

           delegate:(id <UIActionSheetDelegate>)delegate 

  cancelButtonTitle:(NSString *)cancelButtonTitle 

destructiveButtonTitle:(NSString *)destructiveButtonTitle 

  otherButtonTitles:(NSString *)otherButtonTitles{

    

    self = [super initWithTitle:title delegate:delegate 

              cancelButtonTitle:cancelButtonTitle 

         destructiveButtonTitle:destructiveButtonTitle 

              otherButtonTitles:otherButtonTitles,nil];

    

    if (self) {

        titleImage=image;

        [titleImage retain];

        UIImageView *imageView = [[UIImageView alloc] initWithImage:titleImage];

        imageView.frame = CGRectZero;         

        // 

        for (UIView *subView in self.subviews){

            if (![subView isKindOfClass:[UILabel class]]) {

                [self insertSubview:imageView aboveSubview:subView];

                break;

            }

        }

        

        [imageView release];

    }

    return self;

}





- (CGFloat) maxLabelYCoordinate {

    // Determine maximum y-coordinate of labels

    CGFloat maxY = 0;

    for( UIView *view in self.subviews ){

        if([view isKindOfClass:[UILabel class]]) {

            CGRect viewFrame = [view frame];

            CGFloat lowerY = viewFrame.origin.y + viewFrame.size.height;

            if(lowerY > maxY)

                maxY = lowerY;

        }

    }

    return maxY;

}



-(void) layoutSubviews{

    [super layoutSubviews];

    CGRect frame = [self frame];

    CGFloat labelMaxY = [self maxLabelYCoordinate];



    for(UIView *view in self.subviews){

        if (![view isKindOfClass:[UILabel class]]) {    

            if([view isKindOfClass:[UIImageView class]]){

                CGRect viewFrame = CGRectMake((320 - titleImage.size.width)/2, labelMaxY + 10,

                                              titleImage.size.width, titleImage.size.height);

                [view setFrame:viewFrame];

            } 

            else if(![view isKindOfClass:[UIImageView class]]) {

                CGRect viewFrame = [view frame];

                viewFrame.origin.y += titleImage.size.height+10;

                [view setFrame:viewFrame];

            }

        }

    }

    

    frame.origin.y -= titleImage.size.height + 2.0;

    frame.size.height += titleImage.size.height + 2.0;

    [self setFrame:frame];



}

/*

// Only override drawRect: if you perform custom drawing.

// An empty implementation adversely affects performance during animation.

- (void)drawRect:(CGRect)rect {

    // Drawing code.

}

*/



- (void)dealloc {

    [super dealloc];

    if (titleImage) {

        [titleImage release];

    }

}

@end

使用： 

 UIImage *tips3Img = [UIImage imageNamed:@"tips-3.png"];

UIImageActionSheet *tipsActionSheet = [[UIImageActionSheet alloc] 

                                       initWithImage:tips3Img 

                                       title:@"添加的图案可用以下方式调整" 

                                       delegate:self cancelButtonTitle:@"知道了" 

                                       destructiveButtonTitle:nil 

                                       otherButtonTitles:nil];

tipsActionSheet.tag = kActionSheetTagTips;

[tipsActionSheet showInView:self.view];

[tipsActionSheet release];

效果：