Tinting a UITextField’s clear button

Example_UITextField+TintClearButton.m

#import "UITextField+TintClearButton.h"

@implementation MyCustomTextFieldClass

- (void)layoutSubviews
{
    [super layoutSubviews];
    [self tintClearImage];
}

@end

UITextField+TintClearButton.h

// Based of the solution posted here http://stackoverflow.com/a/30532855/123781

@import UIKit;

/**
 *  Apple does not allow the text field clear button image to be tinted. This hack picks out the clear
 *  button and tints it to be the same as the recievers `tintColor` property.
 */
@interface UITextField (TintClearButton)

/**
 *  Tell the reciever that we want the clear button to be tinted.
 */
- (void)tintClearImage;

@end

UITextField+TintClearButton.m

#import "UITextField+TintClearButton.h"
@import ObjectiveC.runtime;

UIImage* UITFC_tintImage(UIImage* image, UIColor* color)
{
    CGSize size = image.size;

    UIGraphicsBeginImageContextWithOptions(size, false, 0);
    CGContextRef context = UIGraphicsGetCurrentContext();
    [image drawAtPoint:CGPointZero blendMode:kCGBlendModeNormal alpha:1.0];

    CGContextSetFillColorWithColor(context, color.CGColor);
    CGContextSetBlendMode(context, kCGBlendModeSourceIn);
    CGContextSetAlpha(context, 1.0);

    CGRect rect = CGRectMake(
            CGPointZero.x,
            CGPointZero.y,
            image.size.width,
            image.size.height);
    CGContextFillRect(UIGraphicsGetCurrentContext(), rect);
    UIImage* tintedImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return tintedImage;
}

@implementation UITextField (TintClearButton)

- (void)tintClearImage
{
    for (UIView* view in self.subviews) {
        if (![view isKindOfClass:[UIButton class]])
            continue;

        UIButton* button = (UIButton*)view;
        [button setImage:[self UITFC_normalClearImageForButton:button] forState:UIControlStateNormal];
        [button setImage:[self UITFC_highlightClearImageForButton:button] forState:UIControlStateHighlighted];
    }
}

- (UIImage*)UITFC_normalClearImageForButton:(UIButton*)button
{
    UIImage* image = [button imageForState:UIControlStateNormal];
    return [self UITFC_getTintImage:image key:@"UITFC_tinted_clear_image_normal"];
}

- (UIImage*)UITFC_highlightClearImageForButton:(UIButton*)button
{
    UIImage* image = [button imageForState:UIControlStateHighlighted];
    return [self UITFC_getTintImage:image key:@"UITFC_tinted_clear_image_highlight"];
}

- (UIImage*)UITFC_getTintImage:(UIImage*)image key:(NSString*)key
{
    UIImage* tintedImage = objc_getAssociatedObject(self, (__bridge const void*)(key));

    if (tintedImage == nil) {
        tintedImage = UITFC_tintImage(image, self.tintColor);
        objc_setAssociatedObject(self, (__bridge const void*)(key), tintedImage, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
    }

    return tintedImage;
}

@end