用KVC的方法
textField.placeholder = @"客户信息";
[textField setValue:[UIColor blackColor] forKeyPath:@"_placeholderLabel.textColor"];
[textField setValue:[UIFont boldSystemFontOfSize:16] forKeyPath:@"_placeholderLabel.font"];
用KVC的方法
textField.placeholder = @"客户信息";
[textField setValue:[UIColor blackColor] forKeyPath:@"_placeholderLabel.textColor"];
[textField setValue:[UIFont boldSystemFontOfSize:16] forKeyPath:@"_placeholderLabel.font"];
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