问题描述

actionSheet的subviews一直为空 为什么 在线等解答

#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;

    //
    NSLog(@"subView:%@",self.subviews);
    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;
  NSLog(@"subView11:%@",self.subviews);
  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

就是这句 NSLog(@"subView:%@",self.subviews); 打印出来一直为空 subView:(
) 为什么啊

解决方案

因为它没有，你直接用代理方法就可以了，干嘛要subview呢？