button图文

发表于

Button是我们平时用的最多的控件之一，经常会遇到图片文字位置的问题，用下面的方法一行代码就可以搞定

创建UIButton分类

.h

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#import <UIKit/UIKit.h>
typedef NS_ENUM(NSUInteger, DCDButtonEdgeInsetsStyle) {
    DCDButtonEdgeInsetsStyleTop, // image在上，label在下
    DCDButtonEdgeInsetsStyleLeft, // image在左，label在右
    DCDButtonEdgeInsetsStyleBottom, // image在下，label在上
    DCDButtonEdgeInsetsStyleRight // image在右，label在左
};
@interface UIButton (TitleImageSpacing)
/**
 *  设置button的titleLabel和imageView的布局样式，及间距
 *
 *  @param style titleLabel和imageView的布局样式
 *  @param space titleLabel和imageView的间距
 */
- (void)layoutButtonWithEdgeInsetsStyle:(DCDButtonEdgeInsetsStyle)style
                        imageTitleSpace:(CGFloat)space;
@end

.m

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#import "UIButton+TitleImageSpacing.h"
@implementation UIButton (TitleImageSpacing)
- (void)layoutButtonWithEdgeInsetsStyle:(DCDButtonEdgeInsetsStyle)style
                        imageTitleSpace:(CGFloat)space
{
    //    self.backgroundColor = [UIColor cyanColor];
    /**
     *  前置知识点：titleEdgeInsets是title相对于其上下左右的inset，跟tableView的contentInset是类似的，
     *  如果只有title，那它上下左右都是相对于button的，image也是一样；
     *  如果同时有image和label，那这时候image的上左下是相对于button，右边是相对于label的；title的上右下是相对于button，左边是相对于image的。
     */
    // 1. 得到imageView和titleLabel的宽、高
    CGFloat imageWith = self.imageView.frame.size.width;
    CGFloat imageHeight = self.imageView.frame.size.height;
    CGFloat labelWidth = 0.0;
    CGFloat labelHeight = 0.0;
    if ([UIDevice currentDevice].systemVersion.floatValue >= 8.0) {
        // 由于iOS8中titleLabel的size为0，用下面的这种设置
        labelWidth = self.titleLabel.intrinsicContentSize.width;
        labelHeight = self.titleLabel.intrinsicContentSize.height;
    } else {
        labelWidth = self.titleLabel.frame.size.width;
        labelHeight = self.titleLabel.frame.size.height;
    }
    // 2. 声明全局的imageEdgeInsets和labelEdgeInsets
    UIEdgeInsets imageEdgeInsets = UIEdgeInsetsZero;
    UIEdgeInsets labelEdgeInsets = UIEdgeInsetsZero;
    // 3. 根据style和space得到imageEdgeInsets和labelEdgeInsets的值
    switch (style) {
        case DCDButtonEdgeInsetsStyleTop:
        {
            imageEdgeInsets = UIEdgeInsetsMake(-labelHeight-space/2.0, 0, 0, -labelWidth);
            labelEdgeInsets = UIEdgeInsetsMake(0, -imageWith, -imageHeight-space/2.0, 0);
        }
            break;
        case DCDButtonEdgeInsetsStyleLeft:
        {
            imageEdgeInsets = UIEdgeInsetsMake(0, -space/2.0, 0, space/2.0);
            labelEdgeInsets = UIEdgeInsetsMake(0, space/2.0, 0, -space/2.0);
        }
            break;
        case DCDButtonEdgeInsetsStyleBottom:
        {
            imageEdgeInsets = UIEdgeInsetsMake(0, 0, -labelHeight-space/2.0, -labelWidth);
            labelEdgeInsets = UIEdgeInsetsMake(-imageHeight-space/2.0, -imageWith, 0, 0);
        }
            break;
        case DCDButtonEdgeInsetsStyleRight:
        {
            imageEdgeInsets = UIEdgeInsetsMake(0, labelWidth+space/2.0, 0, -labelWidth-space/2.0);
            labelEdgeInsets = UIEdgeInsetsMake(0, -imageWith-space/2.0, 0, imageWith+space/2.0);
        }
            break;
        default:
            break;
    }
    // 4. 赋值
    self.titleEdgeInsets = labelEdgeInsets;
    self.imageEdgeInsets = imageEdgeInsets;
}

实现

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for (int i = 1; i < 5; i ++) {
        UIButton *goBtn = [[UIButton alloc] initWithFrame:CGRectMake(100, 150 * i , 200, 100)];
        goBtn.backgroundColor = [UIColor redColor];
        [goBtn setTitle:@"👆微信好友👆" forState:UIControlStateNormal];
        [goBtn setImage:[UIImage imageNamed:@"img_wechat"] forState:UIControlStateNormal];
        if (i == 1) {
            [goBtn layoutButtonWithEdgeInsetsStyle:DCDButtonEdgeInsetsStyleTop imageTitleSpace:10];
        }else if (i == 2){
            [goBtn layoutButtonWithEdgeInsetsStyle:DCDButtonEdgeInsetsStyleLeft imageTitleSpace:10];
        }else if (i == 3){
            [goBtn layoutButtonWithEdgeInsetsStyle:DCDButtonEdgeInsetsStyleBottom imageTitleSpace:10];
        }else if (i == 4){
            [goBtn layoutButtonWithEdgeInsetsStyle:DCDButtonEdgeInsetsStyleRight imageTitleSpace:10];
        }
        [self.view addSubview:goBtn];
    }

效果图

button