iphone - 如何调整 iPhone 中按钮图像的大小

Question

我是 iphone 的新用户。现在我正在 iphone 中开发按钮 ImageView 。这里的图像是显示大尺寸的图像，我想调整图像的大小。这意味着图像以中等尺寸显示。我实现了这样的代码。

 images = [[NSMutableArray alloc]init];
 [images addObject:[UIImage imageNamed:@"bearlarge.jpg"]];
 [images addObject:[UIImage imageNamed:@"bufflo_large.jpg"]];
 [images addObject:[UIImage imageNamed:@"camel_large.jpg"]];
 UIView *view = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];



 int row = 0;
 int column = 0;


 for(int i = 0; i < images.count; ++i) {



 // UIImage *thumb = [images objectAtIndex:i];

  UIButton * button = [UIButton buttonWithType:UIButtonTypeRoundedRect];



   button.frame = CGRectMake(column*105+14, row*105+10, 50,50);


  [button setImage:[images objectAtIndex:i] forState:UIControlStateNormal];
  [button addTarget:self 
       action:@selector(buttonClicked:) 
   forControlEvents:UIControlEventTouchUpInside];
  button.tag = i; 




  [view addSubview:button];

  if (column == 2) {
   column = 0;
   row++;
  } else {
   column++;
  }
   }
 //[view setContentSize:CGSizeMake(320, (row+1) * 80 + 10)];
    self.view = view;
 [view release]; 

任何人都可以向我发送有关如何调整 iPhone 中按钮图像大小的代码吗？

提前谢谢您。

Answer 1

您可以为 UIImage 创建此类别:

- (UIImage *)rescaleImageToSize:(CGSize)size {
    CGRect rect = CGRectMake(0.0, 0.0, size.width, size.height);
    UIGraphicsBeginImageContext(rect.size);
    [self drawInRect:rect];  // scales image to rect
    UIImage *resImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return resImage;
}