帶圖像的uibutton

Question

我有一個使用IB的按鈕。現在我想以編程方式將圖像添加到按鈕。我如何設置圖像大小的按鈕大小，就像我們在IB Layout - > Size to Fit中所做的那樣。我想這樣做編程

謝謝..

Answer 1

您可以將圖像添加到使用UIButton的setImage:forState:方法按鈕，然後設置使用UIView內容上漿的contentMode屬性。

一個例子是這樣的：

UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom]; 
UIImage *img = [UIImage imageNamed:@"myImage.png"]; 

button.frame = CGRectMake(20, 100, img.size.width, img.size.height); 

[button setImage:img forState:UIControlStateNormal]; 
[button setImage:img forState:UIControlStateHilighted]; 
[button setImage:img forState:UIControlStateSelected]; 

button.contentMode = UIViewContentModeScaleToFill; //Look up UIViewContentMode in the documentation for other options 

[self.view addSubview:button]; 

Answer 2

示例代碼，

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 3

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

其中用於contentMode的值可以爲

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; 

我認爲這可以幫助你

Answer 4

的下方的任何一個

使用UIButton的方法sizeToFit（UIView act ually）。