Button 上文字及图片位置设置

.h

#import <UIKit/UIKit.h>

typedef NS_ENUM(NSInteger, ImagePosition) {
    ImagePositionLeft = 0,              //图片在左，文字在右，默认
    ImagePositionRight = 1,             //图片在右，文字在左
    ImagePositionTop = 2,               //图片在上，文字在下
    ImagePositionBottom = 3,            //图片在下，文字在上
};

@interface UIButton (ImagePosition)

/**
 *  利用UIButton的titleEdgeInsets和imageEdgeInsets来实现文字和图片的自由排列
 *  注意：这个方法需要在设置图片和文字之后才可以调用，且button的大小要大于 图片大小+文字大小+spacing
 *
 *  @param spacing 图片和文字的间隔
 */
- (void)setImagePosition:(ImagePosition)postion spacing:(CGFloat)spacing;

@end

.m

#import "UIButton+ImagePosition.h"

@implementation UIButton (ImagePosition)

- (void)setImagePosition:(ImagePosition)postion spacing:(CGFloat)spacing {
    [self setTitle:self.currentTitle forState:UIControlStateNormal];
    [self setImage:self.currentImage forState:UIControlStateNormal];

    
    CGFloat imageWidth = self.imageView.image.size.width;
    CGFloat imageHeight = self.imageView.image.size.height;
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
    CGFloat labelWidth = [self.titleLabel.text sizeWithFont:self.titleLabel.font].width;
    CGFloat labelHeight = [self.titleLabel.text sizeWithFont:self.titleLabel.font].height;
#pragma clang diagnostic pop
    
    CGFloat imageOffsetX = (imageWidth + labelWidth) / 2 - imageWidth / 2;//image中心移动的x距离
    CGFloat imageOffsetY = imageHeight / 2 + spacing / 2;//image中心移动的y距离
    CGFloat labelOffsetX = (imageWidth + labelWidth / 2) - (imageWidth + labelWidth) / 2;//label中心移动的x距离
    CGFloat labelOffsetY = labelHeight / 2 + spacing / 2;//label中心移动的y距离
    
    CGFloat tempWidth = MAX(labelWidth, imageWidth);
    CGFloat changedWidth = labelWidth + imageWidth - tempWidth;
    CGFloat tempHeight = MAX(labelHeight, imageHeight);
    CGFloat changedHeight = labelHeight + imageHeight + spacing - tempHeight;
    
    switch (postion) {
        case ImagePositionLeft:
            self.imageEdgeInsets = UIEdgeInsetsMake(0, -spacing/2, 0, spacing/2);
            self.titleEdgeInsets = UIEdgeInsetsMake(0, spacing/2, 0, -spacing/2);
            self.contentEdgeInsets = UIEdgeInsetsMake(0, spacing/2, 0, spacing/2);
            break;
            
        case ImagePositionRight:
            self.imageEdgeInsets = UIEdgeInsetsMake(0, labelWidth + spacing/2, 0, -(labelWidth + spacing/2));
            self.titleEdgeInsets = UIEdgeInsetsMake(0, -(imageWidth + spacing/2), 0, imageWidth + spacing/2);
            self.contentEdgeInsets = UIEdgeInsetsMake(0, spacing/2, 0, spacing/2);
            break;
            
        case ImagePositionTop:
            self.imageEdgeInsets = UIEdgeInsetsMake(-imageOffsetY, imageOffsetX, imageOffsetY, -imageOffsetX);
            self.titleEdgeInsets = UIEdgeInsetsMake(labelOffsetY, -labelOffsetX, -labelOffsetY, labelOffsetX);
            self.contentEdgeInsets = UIEdgeInsetsMake(imageOffsetY, -changedWidth/2, changedHeight-imageOffsetY, -changedWidth/2);
            break;
            
        case ImagePositionBottom:
            self.imageEdgeInsets = UIEdgeInsetsMake(imageOffsetY, imageOffsetX, -imageOffsetY, -imageOffsetX);
            self.titleEdgeInsets = UIEdgeInsetsMake(-labelOffsetY, -labelOffsetX, labelOffsetY, labelOffsetX);
            self.contentEdgeInsets = UIEdgeInsetsMake(changedHeight-imageOffsetY, -changedWidth/2, imageOffsetY, -changedWidth/2);
            break;
            
        default:
            break;
    }
    
}


@end