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[btn addTarget:self action:@selector(searchButtonClick) forControlEvents:UIControlEventTouchUpInside];
[btn setImage:[UIImage imageNamed:@"Icon"] forState:UIControlStateNormal];
[btn setImage:[UIImage imageNamed:@"Icon"] forState:UIControlStateSelected];
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原文地址：http://www.cnblogs.com/SimonGao/p/5051429.html
