文字
button.contentVerticalAlignment = UIControlContentVerticalAlignmentBottom;
button. contentHorizontalAlignment =UIControlContentHorizontalAlignmentLeft;
图标
[button setImage:[UIImage imageNamed:@"jiahao.png"] forState:UIControlStateNormal];
[button setImageEdgeInsets:UIEdgeInsetsMake(5, 10, 5, 65)];
[button setImageEdgeInsets:UIEdgeInsetsMake(5, 10, 5, 65)];
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