UITextField的Placeholder颜色的三种方式

attributedPlaceholder.m

//第一种
UITextField *textField = [[UITextField alloc] init];
NSAttributedString *attrString = [[NSAttributedString alloc] initWithString:@"请输入占位文字"
																 attributes:@{NSForegroundColorAttributeName:[UIColor redColor],NSFontAttributeName:textField.font}];
textField.attributedPlaceholder = attrString;

//第二种
UITextField *textField1 = [[UITextField alloc] init];
textField1.placeholder = @"请输入占位文字";
textField1.font = [UIFont systemFontOfSize:14];
// "通过KVC修改占位文字的颜色"
[textField1 setValue:[UIColor greenColor] forKeyPath:@"_placeholderLabel.textColor"];
[self.view addSubview:textField1];

//第三种
// 重写此方法
-(void)drawPlaceholderInRect:(CGRect)rect {
    // 计算占位文字的 Size
    CGSize placeholderSize = [self.placeholder sizeWithAttributes:
                              @{NSFontAttributeName : self.font}];
 
    [self.placeholder drawInRect:CGRectMake(0, (rect.size.height - placeholderSize.height)/2, rect.size.width, rect.size.height) withAttributes:
    @{NSForegroundColorAttributeName : [UIColor redColor],
                 NSFontAttributeName : self.font}];