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我有UIButton并用正确的代码设置了它的背景图像。

`[button setImage:self.image forState:UIControlStateNormal]`

它在按钮初始化时显示正确的图像,但我想让图像在状态为UIControlStateSelected.

我能够在选择图像时更改图像,但不知道选择时哪个是正确的函数或值设置为无图像。

我应该这样做image alpha0.0

谢谢!

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4 回答 4

4

使用 Photoshop,创建具有透明背景的新图像。将其保存为 nope.png 文件,将其拖到您的项目中。然后

[button setImage:[UIImage imageNamed:@"nope.png"] forState:UIControlStateSelected];

另一种方法是您需要创建新的图像类别:

@interface UIImage (UIImageFrameColor)
+(UIImage *)imageWithColor:(UIColor *)color andSize:(CGSize)size;
@end

@implementation UIImage (UIImageFrameColor)
+(UIImage *)imageWithColor:(UIColor *)color andSize:(CGSize)size
{
    UIGraphicsBeginImageContextWithOptions(size, YES, 0);

    [color set];
    UIBezierPath * path = [UIBezierPath bezierPathWithRect:CGRectMake(0, 0, size.width, size.height)];
    [path fill];

    UIImage *image = UIGraphicsGetImageFromCurrentImageContext ();
    UIGraphicsEndImageContext();

    return image;
}
@end

然后您需要使图像具有与按钮超级视图的背景颜色相同的颜色

    UIImage *bgImage = [UIImage imageWithColor:button.supperview.backgroundColor andSize:button.frame.size];
    [button setImage:bgImage forState:UIControlStateSelected];
于 2013-08-23T00:16:25.563 回答
1

请检查并尝试。这可能对您有用:

[button setImage:[UIImage imageNamed:@"normal.png"] forState:UIControlStateNormal];
[button setImage:[UIImage imageNamed:@"pressed.png"] forState:UIControlStateHighlighted];
[button setImage:[UIImage imageNamed:@"checked.png"] forState:UIControlStateSelected];
于 2013-08-23T05:52:39.657 回答
1

尝试[button setImage:nil forState:UIControlStateSelected];

希望这可以帮助!

于 2013-08-23T00:13:16.377 回答
1

试试 [按钮 setSeleted:YES];

如果你想创建一个像检查列表按钮这样的按钮。这是一个示例代码:

[button setImage:imageNormal forState:UIControlStateNormal];
[button setImage:imageSelected forState:UIControlStateSelected];
.....

-(void)btnButtonPressed:(UIButton*)sender {
    [sender setSelected:!sender.selected];
}

希望这对你有帮助!

于 2013-08-23T02:32:59.580 回答