参考：
调整UIButton中的imageView和titleLabel的相对位置
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通过调整子控件的【边缘内边距】edgeInset来实现：imageEdgeInsets 、titleEdgeInsets
这种方式感觉不好调，调起来貌似不太准
==
还是建议自定义按钮的方式，而且其他地方用起来也方便
h文件
#import <UIKit/UIKit.h>
@interface Btn : UIButton
@end
m文件
#import "Btn.h"
@implementation Btn
// 自定义按钮的frame方法
- (instancetype)initWithFrame:(CGRect)frame
{
if (self = [super initWithFrame:frame]) {
self.titleLabel.textAlignment = NSTextAlignmentCenter;
// 字体不分状态
self.titleLabel.font = [UIFont systemFontOfSize:14];
self.titleLabel.lineBreakMode = NSLineBreakByTruncatingTail;
[self setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
self.backgroundColor = [UIColor clearColor];
}
return self ;
}
- (void)layoutSubviews
{
[super layoutSubviews];
CGFloat buttonW = self.frame.size.width;
CGFloat buttonH = self.frame.size.height;
CGFloat imageW = 20;
self.titleLabel.frame = CGRectMake(0, 0,buttonW - imageW + 5, buttonH);
self.imageView.frame = CGRectMake(self.titleLabel.frame.size.width - 5, 5, imageW, imageW);
}
@end
使用
_btn = [[Btn alloc] initWithFrame:CGRectMake(0, 0, left_width, 28)];
