[self.phoneNumberTF setValue:RGB(143, 144, 144) forKeyPath:@"_placeholderLabel.textColor"];
[self.phoneNumberTF setValue:[UIFont boldSystemFontOfSize:15*kRating] forKeyPath:@"_placeholderLabel.font"];// 字体代码要放在设置文本框字体大小后面
[self.phoneNumberTF setValue:RGB(143, 144, 144) forKeyPath:@"_placeholderLabel.textColor"];
[self.phoneNumberTF setValue:[UIFont boldSystemFontOfSize:15*kRating] forKeyPath:@"_placeholderLabel.font"];// 字体代码要放在设置文本框字体大小后面
本文标题：修改placeholder字体颜色
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