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_button.titleLabel.text = [NSString stringWithFormat:@"%d后重发",t];
[_button setTitle:[NSString stringWithFormat:@"%d后重发",t] forState:UIControlStateNormal];
//需要同时设置titleLable的text和title
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原文地址:http://www.cnblogs.com/xiaojiang-123/p/5330605.html