Demo地址
Demo中包含本人学习的所有资料，还有一些封装的Pod组件，欢迎下载Star，如果有错误的地方，还请指出，详情查看 README.md
开发了这么多年，每次遇到调整 Button 的图片和文字位置的问题，都要去搜索，然后各种尝试，解决方案虽然有，但是没有一篇文章给我说明白是怎么回事的。
这种事情还是需要自己来啊，终于解了多年的疑惑，居然如此简单
以下仅针对
button 的 setTitleEdgeInsets 和 setImageEdgeInsets 方法
效果图
图一
原理
/**
* UIEdgeInsetsMake(上, 左, 下, 右)
* 偏移参照物为自己，初始偏移量是0
* 偏移量计算公式：
* offsetX = (左-右)/2 ,为正 则向右偏移，为负则向左偏移
* offsetY = (上-下)/2 ,为正 则向下偏移，为负则向上偏移
*
* 最终偏移量是根据最终算出来的数值决定 (offsetX,offsetY)
*/
就是这么简单
如果我们要将文字向右偏移 5个点，以下四种结果相同，
即 (左-右) / 2 = offsetX = 5
// 第一种
[btn setTitleEdgeInsets:UIEdgeInsetsMake(0, 10, 0，0)];
// 第二种
[btn setTitleEdgeInsets:UIEdgeInsetsMake(0, 0, 0，-10)];
// 第三种
[btn setTitleEdgeInsets:UIEdgeInsetsMake(0, -15, 0，-25)];
// 第四种
[btn setTitleEdgeInsets:UIEdgeInsetsMake(0, 5, 0，-5)];
源码中：Demo实例 ，效果图为 图一
-(void)setUpSubViews{
UIButton *btn = [[UIButton alloc]init];
btn.backgroundColor = [UIColor lightGrayColor];
[btn setTitle:@"居左button" forState:UIControlStateNormal];
[self.view addSubview:btn];
[btn mas_makeConstraints:^(MASConstraintMaker *make) {
make.left.offset(100);
make.right.offset(-100);
make.top.offset(STATUSNAVIBAR_HEIGHT + 100);
make.height.mas_equalTo(80);
}];
UIButton *btn1 = [[UIButton alloc]init];
btn1.backgroundColor = [UIColor lightGrayColor];
[btn1 setTitle:@"居右button" forState:UIControlStateNormal];
[self.view addSubview:btn1];
[btn1 mas_makeConstraints:^(MASConstraintMaker *make) {
make.left.offset(100);
make.right.offset(-100);
make.top.equalTo(btn.mas_bottom).offset(50);
make.height.mas_equalTo(80);
}];
UIButton *btn2 = [[UIButton alloc]init];
btn2.backgroundColor = [UIColor lightGrayColor];
[btn2 setTitle:@"左上button" forState:UIControlStateNormal];
[self.view addSubview:btn2];
[btn2 mas_makeConstraints:^(MASConstraintMaker *make) {
make.left.offset(100);
make.right.offset(-100);
make.top.equalTo(btn1.mas_bottom).offset(50);
make.height.mas_equalTo(80);
}];
UIButton *btn3 = [[UIButton alloc]init];
btn3.backgroundColor = [UIColor lightGrayColor];
[btn3 setTitle:@"右下button" forState:UIControlStateNormal];
[self.view addSubview:btn3];
[btn3 mas_makeConstraints:^(MASConstraintMaker *make) {
make.left.offset(100);
make.right.offset(-100);
make.top.equalTo(btn2.mas_bottom).offset(50);
make.height.mas_equalTo(80);
}];
UIButton *btn4 = [[UIButton alloc]init];
btn4.backgroundColor = [UIColor lightGrayColor];
[btn4 setTitle:@"带图IMAGE" forState:UIControlStateNormal];
[btn4 setImage:[UIImage imageNamed:@"time"] forState:UIControlStateNormal];
[self.view addSubview:btn4];
[btn4 mas_makeConstraints:^(MASConstraintMaker *make) {
make.left.offset(100);
make.right.offset(-100);
make.top.equalTo(btn3.mas_bottom).offset(50);
make.height.mas_equalTo(80);
}];
///===================================///
///============开始测试偏移量===========///
///===================================///
[self.view layoutIfNeeded];
[self.view setNeedsLayout];
//图片文字宽度
CGFloat textW = btn.titleLabel.intrinsicContentSize.width;
CGFloat btnW = btn.width;
CGFloat offsetX = (btnW - textW)/2;
//图片文字高度
CGFloat textH = btn.titleLabel.intrinsicContentSize.height;
CGFloat btnH = btn.height;
CGFloat offsetY = (btnH - textH)/2;
/// 偏移量计算：(0-offsetX * 2)/2 = -offsetX
[btn setTitleEdgeInsets:UIEdgeInsetsMake(0, 0, 0, offsetX * 2)];
///常规对称写法：数值相同，一正一负
// /// 偏移量计算：(offsetX- (-offsetX))/2 = offsetX
// [btn1 setTitleEdgeInsets:UIEdgeInsetsMake(0, offsetX, 0, -offsetX)];
/// 非对称数值测试
/// 偏移量计算：((offsetX+20) - (-offsetX + 20))/2 = offsetX
[btn1 setTitleEdgeInsets:UIEdgeInsetsMake(10, -1000, 2, -1000-offsetX*2)];
[btn2 setTitleEdgeInsets:UIEdgeInsetsMake(0, 0, offsetY * 2, offsetX * 2)];
[btn3 setTitleEdgeInsets:UIEdgeInsetsMake(offsetY, offsetX, -offsetY, -offsetX)];
CGFloat imgW = btn4.imageView.intrinsicContentSize.width;
CGFloat textW1 = btn4.titleLabel.intrinsicContentSize.width;
/// 图文：设置文字图片调换位置，且图片文字间隔 10 个点
[btn4 setTitleEdgeInsets:UIEdgeInsetsMake(0, -(imgW + 5)*2, 0, 0)];
[btn4 setImageEdgeInsets:UIEdgeInsetsMake(0, 0, 0, -(textW1 + 5)*2)];
}
