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[bottomButton setTitleEdgeInsets:UIEdgeInsetsMake(10, -190, 10, 44)]; //上左下右
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button.contentVerticalAlignment = UIControlContentVerticalAlignmentBottom;
button. contentHorizontalAlignment =UIControlContentHorizontalAlignmentLeft;
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原文地址：http://www.cnblogs.com/Bo-tree/p/5161322.html
