如何根据 iphone 中的文本大小动态增加按钮宽度？

Question

我以编程方式创建了 10 个按钮并在按钮中设置了标题。现在我想动态增加按钮框架的大小，它取决于文本。

我给出了一些条件并设置了帧大小。但是我如何设置确切的帧大小取决于文本（动态获取文本）。

这是我的示例代码，

     float x=0, y=0, w, h=20;

    for(int i = 100; i < 110; i++)
     {
         btn = [[UIButton buttonWithType:UIButtonTypeRoundedRect] retain];

         UIImage * img = [UIImage imageNamed:@"Round_Rect4.png"];

        [btn setBackgroundImage:img forState:UIControlStateSelected];

        titleString = [titleArray objectAtIndex:i-100];  // get button title

        if([titleString length] <= 5)
        {
            w = 50;
            btn.frame = CGRectMake(x,y,w,h); 

            x = x + 70;
        }

        if (([titleString length] >= 6) && ([titleString length] <=10))
       {
             w = 70;

             btn.frame = CGRectMake(x,y,w,h); 

             x = x + 90;
       } 

       if(([titleString length] >= 11) && ([titleString length] <=15))
       {
             w = 105;
             btn.frame = CGRectMake(x,y,w,h); 

             x = x + 120;

       }

       if([titleString length] >= 16)
       {
             w = 120;
             btn.frame = CGRectMake(x,y,w,h); 

             x = x + 140;

       }

        [btn setTitle:titleString forState: UIControlStateNormal];

        [btn setTag:i];

        [self.view addSubview:btn];

}

查看示例图片，

image-2 http://www.freeimagehosting.net/uploads/b6e0f234dc.png image-1 http://www.freeimagehosting.net/uploads/6b3daab12f.png

那么这是否可以设置取决于文本的确切按钮框架大小？请指导我。

谢谢

Answer 1

非常简单的解决方案：

TestButton.titleEdgeInsets = UIEdgeInsetsMake(0, 8, 0, 8);
[TestButton sizeToFit];
float width  =   TestButton.frame.size.width + 20;
TestButton.frame = CGRectMake(TestButton.frame.origin.x, TestButton.frame.origin.y, width, 40);

Answer 2

我得到了答案，我的工作代码是，

        float x=0;

        for(int i = 100; i < 110; i++)
         {
             btn = [[UIButton buttonWithType:UIButtonTypeRoundedRect] retain];

             UIImage * img = [UIImage imageNamed:@"Round_Rect4.png"];

            [btn setBackgroundImage:img forState:UIControlStateSelected];

            titleString = [titleArray objectAtIndex:i-100];  // get button title

           CGSize fontSize = [titleString sizeWithFont:[UIFont systemFontOfSize:12.0]];

            CGRect currentFrame = btn.frame;

            CGRect buttonFrame = CGRectMake(x, currentFrame.origin.y, fontSize.width + 22.0, fontSize.height + 12.0);

           [btn setFrame:buttonFrame];

            x = x + fontSize.width + 35.0;

            [btn setTitle:titleString forState: UIControlStateNormal];

            [btn setTag:i];

            [self.view addSubview:btn];

}

Answer 3

从 Apples Bubble Level 源代码复制粘贴。

这是你想要的线

UIImage *newImage = [image stretchableImageWithLeftCapWidth:10 topCapHeight:10];

完整代码在这里

- (UIButton *)buttonWithTitle:(NSString *)title target:(id)target selector:(SEL)inSelector frame:(CGRect)frame image:(UIImage*)image {
    UIButton *button = [[UIButton alloc] initWithFrame:frame];
    button.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;
    button.contentHorizontalAlignment = UIControlContentHorizontalAlignmentCenter;
    [button setTitle:title forState:UIControlStateNormal & UIControlStateHighlighted & UIControlStateSelected];
    [button setTitleColor:[UIColor blackColor] forState:UIControlEventTouchDown];
    UIImage *newImage = [image stretchableImageWithLeftCapWidth:10 topCapHeight:10];
    [button setBackgroundImage:newImage forState:UIControlStateNormal];
    [button addTarget:target action:inSelector forControlEvents:UIControlEventTouchUpInside];
    button.adjustsImageWhenDisabled = YES;
    button.adjustsImageWhenHighlighted = YES;
    [button setBackgroundColor:[UIColor clearColor]];   // in case the parent view draws with a custom color or gradient, use a transparent color
    [button autorelease];
    return button;
}

Answer 4

[btn sizeToFit]