關於UIButton裏面帶有圖片的研究

<span style="color:#3333ff;">如果一個Button裏面帶有圖片，基本上我們用到有兩種情況，一種是文字在左圖片在右，一種是圖片在左文字在右，針對這兩種情況我們一般是可以設置UIButton的
setImageEdgeInsets屬性，但是這樣去改變有時候會很麻煩，所以我的入手點變爲重寫Button的方法。</span>

<span style="color:#ff0000;">一、圖片在文字左邊的情況：</span>
#define ButtonTitleFont [UIFont systemFontOfSize:14]

@implementation OKWMyButton

- (id)initWithFrame:(CGRect)frame

{
    
    self = [superinitWithFrame:frame];
    
    if (self) {
        
        <span style="color:#009900;">//可根據自己的需要隨意調整</span>
        
        self.titleLabel.textAlignment =NSTextAlignmentLeft;
        
        self.titleLabel.font =ButtonTitleFont;
        
        self.imageView.contentMode =UIViewContentModeScaleAspectFit;
        
    }
    
    returnself;
    
}

<span style="color:#009900;">//重寫父類UIButton的方法

//更具button的rect設定並返回文本label的rect</span>

- (CGRect)titleRectForContentRect:(CGRect)contentRect

{
    
    CGFloat titleW = contentRect.size.width-30;
    
    CGFloat titleH = contentRect.size.height;
    
    CGFloat titleX =30;
    
    CGFloat titleY =0;
    
    contentRect = (CGRect){{titleX,titleY},{titleW,titleH}};
    
    return contentRect;
    
}

<span style="color:#009900;">//更具button的rect設定並返回UIImageView的rect</span>

- (CGRect)imageRectForContentRect:(CGRect)contentRect

{
    
    CGFloat imageW =20;
    
    CGFloat imageH =20;
    
    CGFloat imageX =5;
    
    CGFloat imageY =12;
    
    contentRect = (CGRect){{imageX,imageY},{imageW,imageH}};
    
    return contentRect;
    
}


<span style="color:#ff0000;">二、圖片在文字右邊</span>
#define ButtonTitleFont [UIFont systemFontOfSize:14]

@implementation OKWMyImageRightButton

- (id)initWithFrame:(CGRect)frame

{
    
    self = [superinitWithFrame:frame];
    
    if (self) {
        
        <span style="color:#009900;">//可根據自己的需要隨意調整</span>
        
        self.titleLabel.textAlignment =NSTextAlignmentRight;
        
        self.titleLabel.font =ButtonTitleFont;
        
        self.imageView.contentMode =UIViewContentModeScaleAspectFit;
        
    }
    
    returnself;
    
}

<span style="color:#009900;">//重寫父類UIButton的方法

//更具button的rect設定並返回文本label的rect</span>

- (CGRect)titleRectForContentRect:(CGRect)contentRect

{
    
    CGFloat titleW = contentRect.size.width-24;
    
    CGFloat titleH = contentRect.size.height;
    
    CGFloat titleX =0;
    
    CGFloat titleY =0;
    
    contentRect = (CGRect){{titleX,titleY},{titleW,titleH}};
    
    return contentRect;
    
}

<span style="color:#009900;">//更改button的rect設定並返回UIImageView的rect</span>

- (CGRect)imageRectForContentRect:(CGRect)contentRect

{
    
    CGFloat imageW =5;
    
    CGFloat imageH =10;
    
    CGFloat imageX = contentRect.size.width-24;
    
    CGFloat imageY =15;
    
    contentRect = (CGRect){{imageX,imageY},{imageW,imageH}};
    
    return contentRect;
    
}