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第一种
UIColor *color = [UIColor whiteColor];
_userName.attributedPlaceholder = [[NSAttributedString alloc] initWithString:@"用户名" attributes:@{NSForegroundColorAttributeName: color}];
第二种
[_userName setValue:[UIColor whiteColor] forKeyPath:@"_placeholderLabel.textColor"];
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原文地址:http://www.cnblogs.com/wangguimin/p/5578172.html