uibutton与图像

Question

我正在使用IB按钮。现在我想以编程方式向按钮添加图像。如何像在IB布局中那样设置按钮的图像尺寸大小 - ＆gt;尺寸适合。我想以编程方式执行此操作

谢谢..

Answer 1

您可以使用UIButton的{​​{1}}方法将图像添加到按钮，然后使用setImage:forState:的{​​{1}}属性设置内容大小。

示例如下：

UIView

Answer 2

[yourButton setImage:yourImage forState:UIControlStateNormal];
yourButton.contentMode = UIViewContentModeScaleToFill;

contentMode的值可以是以下任何一个

typedef enum {
    UIViewContentModeScaleToFill,
    UIViewContentModeScaleAspectFit,      // contents scaled to fit with fixed aspect. remainder is transparent
    UIViewContentModeScaleAspectFill,     // contents scaled to fill with fixed aspect. some portion of content may be clipped.
    UIViewContentModeRedraw,              // redraw on bounds change (calls -setNeedsDisplay)
    UIViewContentModeCenter,              // contents remain same size. positioned adjusted.
    UIViewContentModeTop,
    UIViewContentModeBottom,
    UIViewContentModeLeft,
    UIViewContentModeRight,
    UIViewContentModeTopLeft,
    UIViewContentModeTopRight,
    UIViewContentModeBottomLeft,
    UIViewContentModeBottomRight,
} UIViewContentMode;

我认为这可以帮到你

Answer 3

示例代码，

UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
UIImage *img1 = [UIImage imageNamed:@"image1.png"];
btn.frame = CGRectMake(20.0 , 270.0, img1.size.width, img1.size.height);
[btn setImage:img1 forState:UIControlStateNormal]; 
UIImage *img2 = [UIImage imageNamed:@"image2.png"];
[btn setImage:img2 forState:UIControlStateHighlighted];
[btn setImage:img2 forState:UIControlStateSelected];
[btn addTarget:self action:@selector(Action:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:btn];

Answer 4

使用UIButton的 sizeToFit 方法（实际上是UIView）。