iOS UIButton调整文字和图片的位置

👉🏻 前言：UIButton的位置默认是左图右文字

一、直接设置左文字右图，利用原有属性 semanticContentAttribute

在需要图片和文字，而且还能点击的控件，button 是当之无愧的选择，button 默认的模式是图片在左，文字在右，以往需要调整文字和图片的顺序的时候，需要重写 button，今天发现了一个新的办法，就是一个叫 semanticContentAttribute 的属性，有四个选择，默认就是 Unspecified，然后选择Force Right-to-Left 就变成图片在右边，文字在左边的效果了
testButton.semanticContentAttribute = UISemanticContentAttributeForceRightToLeft;

二、写一个分类，可以实现多种组合

上文字下图，上图下文字 ，左图右文字，左文字右图

上文字下图.png
上图下文字.png
左图右文字.png
左文字右图.png

UIButton+zt_adjustImageAndTitle.h

//  PresentTest
//
//  Created by xzq on 2020/8/10.
//  Copyright © 2020年 xzq. All rights reserved.
//

#import <UIKit/UIKit.h>

/**
 使用范例：
 
     UIButton    * testButton = [[UIButton alloc] initWithFrame:CGRectMake(100, 100, 200, 100)];
     testButton.backgroundColor = [UIColor redColor];
     [testButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
     [testButton setTitle:@"我是测试" forState:UIControlStateNormal];
     [testButton setImage:[UIImage imageNamed:@"home_icon_arrow"] forState:UIControlStateNormal];
 
     testButton.zt_contentAdjustType = ZTContentAdjustImageDownTitleUp;
     testButton.zt_space = 5;
     [testButton zt_beginAdjustContent];
 
     [self.view addSubview:testButton];
 */

typedef NS_ENUM(NSUInteger, ZTContentAdjustType) {
    ZTContentAdjustImageLeftTitleRight = 0,// default
    ZTContentAdjustImageRightTitleLeft,
    ZTContentAdjustImageUpTitleDown,
    ZTContentAdjustImageDownTitleUp
};

@interface UIButton (zt_adjustImageAndTitle)
@property (nonatomic, assign) ZTContentAdjustType    zt_contentAdjustType;//图片与文字的结构 默认图片在左，文字在右
@property (nonatomic, assign) CGFloat    zt_space;// 图片与文字的间距 默认是5
/*
 开始调整内容
 调用前，请确保设置好title以及image
 */
- (void)zt_beginAdjustContent;
/*
 zt_beginAdjustContent 默认在下一次runloop进行更新，这个方法提供直接更新
 */
- (void)zt_beginAdjustContentImmediately;
/*
 可以传入文字最大宽度
 */
- (void)zt_beginAdjustContentWithMaxTitleWidth:(CGFloat)maxTitleWidth;
@end

UIButton+zt_adjustImageAndTitle.m

//
//  UIButton+zt_adjustImageAndTitle.m
//  PresentTest
//
//  Created by xzq on 2020/8/10.
//  Copyright © 2020年 xzq. All rights reserved.
//

#import "UIButton+zt_adjustImageAndTitle.h"
#import <objc/runtime.h>

const void * zt_spaceKey = "zt_spaceKey";
const void * zt_contentAdjustTypeKey = "zt_contentAdjustTypeKey";

@implementation UIButton (zt_adjustImageAndTitle)

@dynamic zt_contentAdjustType,zt_space;


- (void)zt_beginAdjustContent {
    [self zt_beginAdjustContentWithMaxTitleWidth:0];
}

- (void)zt_beginAdjustContentImmediately {
    [self _zt_beginAdjustContentWithMaxTitleWidth:0];
}

- (void)zt_beginAdjustContentWithMaxTitleWidth:(CGFloat)maxTitleWidth {
    dispatch_async(dispatch_get_main_queue(), ^{
        [self _zt_beginAdjustContentWithMaxTitleWidth:maxTitleWidth];
    });
}

- (void)zt_beginAdjustContentImmediatelyWithMaxTitleWidth:(CGFloat)maxTitleWidth {
    [self _zt_beginAdjustContentWithMaxTitleWidth:maxTitleWidth];
}

#pragma mark---- private

- (void)_zt_beginAdjustContentWithMaxTitleWidth:(CGFloat)maxTitleWidth {
    UIImage    * btnImage = self.imageView.image;
    NSString    * btnTitle = self.titleLabel.text;
    
    if (!btnImage || btnTitle.length <= 0) {
        NSAssert(false, @"请先设置按钮的图片以及文字");
        return;
    }
    
    CGSize imageSize = btnImage.size;
    CGFloat imageWidth = imageSize.width;
    CGFloat imageHeight = imageSize.height;
    
    CGSize titleSize = [self.titleLabel sizeThatFits:CGSizeZero];
    CGFloat titleWidth = titleSize.width;
    CGFloat titleHeight = titleSize.height;
    
    if (maxTitleWidth > 0 && titleWidth > maxTitleWidth) {
        titleWidth = maxTitleWidth;
    }
    
    CGFloat space = self.zt_space;
    
    switch (self.zt_contentAdjustType) {
        case ZTContentAdjustImageLeftTitleRight: {
            [self setTitleEdgeInsets:UIEdgeInsetsMake(0, (space*0.5), 0, -(space*0.5))];
            [self setImageEdgeInsets:UIEdgeInsetsMake(0, -(space*0.5), 0, (space*0.5))];
        }
            break;
        case ZTContentAdjustImageRightTitleLeft: {
            [self setTitleEdgeInsets:UIEdgeInsetsMake(0, -(imageWidth+space*0.5), 0, (imageWidth+space*0.5))];
            [self setImageEdgeInsets:UIEdgeInsetsMake(0, (titleWidth + space*0.5), 0, -(titleWidth + space*0.5))];
        }
            break;
        case ZTContentAdjustImageUpTitleDown: {
            [self setTitleEdgeInsets:UIEdgeInsetsMake((titleHeight+space)*0.5, -imageWidth*0.5, -(titleHeight+space)*0.5, imageWidth*0.5)];
            [self setImageEdgeInsets:UIEdgeInsetsMake(-(imageHeight+space)*0.5, titleWidth*0.5, (imageHeight+space)*0.5, -titleWidth*0.5)];
        }
            break;
        case ZTContentAdjustImageDownTitleUp: {
            [self setTitleEdgeInsets:UIEdgeInsetsMake(-(titleHeight+space)*0.5, -imageWidth*0.5, (titleHeight+space)*0.5, imageWidth*0.5)];
            [self setImageEdgeInsets:UIEdgeInsetsMake((imageHeight+space)*0.5, titleWidth*0.5, -(imageHeight+space)*0.5, -titleWidth*0.5)];
        }
            break;
        default: {
            [self setTitleEdgeInsets:UIEdgeInsetsMake(0, (space*0.5), 0, -(space*0.5))];
            [self setImageEdgeInsets:UIEdgeInsetsMake(0, -(space*0.5), 0, (space*0.5))];
        }
            break;
    }
}

#pragma mark---- getter and setter

- (CGFloat)zt_space {
    NSNumber * objc = objc_getAssociatedObject(self, zt_spaceKey);
    if (!objc) {
        return 5;
    }
    return [objc floatValue];
}

- (void)setZt_space:(CGFloat)zt_space {
    objc_setAssociatedObject(self, zt_spaceKey, @(zt_space), OBJC_ASSOCIATION_RETAIN);
}

- (ZTContentAdjustType)zt_contentAdjustType {
    NSNumber * objc = objc_getAssociatedObject(self, zt_contentAdjustTypeKey);
    return [objc floatValue];
}

- (void)setZt_contentAdjustType:(ZTContentAdjustType)zt_contentAdjustType {
    objc_setAssociatedObject(self, zt_contentAdjustTypeKey, @(zt_contentAdjustType), OBJC_ASSOCIATION_RETAIN);
}

@end