Question

我是iphone中的新手。现在开发iphone中的按钮图像视图。其中图像是显示大尺寸的图像我想调整图像大小。这意味着图像显示为中等大小。我实现这样的代码。

 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];

任何人都可以发送代码来解释如何在iphone中调整按钮图像的大小。

先谢谢你。

Answer 1

最好在按钮上添加UIImageView。这样你就可以轻松改变画面尺寸。

<强> CODE

UIButton *imageBut=[[UIButton alloc]initWithFrame:CGRectMake(0, 0, 100, 100)];
UIImageView *img=[[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
img.userInteractionEnabled=NO;
[imageBut addSubview:img];
[self.view addSubview:imageBut];
[imageBut release];
[img release];

否则，请使用

[button setBackgroundImage:YourImage];

Answer 2

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;
}

Answer 3

setImage会将图像设置为原始大小，并将其包含在项目中。

setBackgroundImage将调整原始图像的大小。

[button setBackgroundImage:[images objectAtIndex:i] forState:UIControlStateNormal];

Answer 4

-(void)scaleImage:(id)sender 
{
      if([(UIPinchGestureRecognizer*)sender state] == UIGestureRecognizerStateEnded) 
      {
        lastScale = 1.0;
        return;
      }

  CGFloat scale = 1.0 - (lastScale - [(UIPinchGestureRecognizer*)sender scale]);

      CGAffineTransform currentTransform = [(UIPinchGestureRecognizer*)sender view].transform;

     CGAffineTransform newTransform = CGAffineTransformScale(currentTransform, scale, scale);

  [[(UIPinchGestureRecognizer*)sender view] setTransform:newTransform];

   lastScale = [(UIPinchGestureRecognizer*)sender scale];

}

如何在iPhone中调整按钮图像的大小

4 个答案: