Change of UITextField placeholder color

From Docs

@property(nonatomic, copy) NSAttributedString *attributedPlaceholder

This property is nil by default. If set, the placeholder string is
drawn using a 70% grey color and the remaining style information
(except the text color) of the attributed string. Assigning a new
value to this property also replaces the value of the placeholder
property with the same string data, albeit without any formatting
information. Assigning a new value to this property does not affect
any other style-related properties of the text field.

Objective-C

NSAttributedString *str = [[NSAttributedString alloc] initWithString:@"Some Text" attributes:@{ NSForegroundColorAttributeName : [UIColor redColor] }];
self.myTextField.attributedPlaceholder = str;

Swift

let str = NSAttributedString(string: "Text", attributes: [NSForegroundColorAttributeName:UIColor.redColor()])
myTextField.attributedPlaceholder = str

Swift 4

let str = NSAttributedString(string: "Text", attributes: [NSAttributedString.Key.foregroundColor: UIColor.red])
myTextField.attributedPlaceholder = str