How do I display the standard checkmark on a UICollectionViewCell?

I ended up recreating the checkmarks using PaintCode. Here's what they look like:

They're drawn with vector graphics, so they'll look great at whatever size you want. These are 30x30. I also included an option to use a grayed-out checkmark instead of the open circle when an item is not selected.

To use these, copy the following class into your project. Then, add a UIView to your storyboard or xib, and set its custom class to SSCheckMark.

SSCheckMark.h

#import <UIKit/UIKit.h>typedef NS_ENUM( NSUInteger, SSCheckMarkStyle ){    SSCheckMarkStyleOpenCircle,    SSCheckMarkStyleGrayedOut};@interface SSCheckMark : UIView@property (readwrite) bool checked;@property (readwrite) SSCheckMarkStyle checkMarkStyle;@end

SSCheckMark.m

#import "SSCheckMark.h"@implementation SSCheckMark- (void) drawRect:(CGRect)rect{    [super drawRect:rect];    if ( self.checked )        [self drawRectChecked:rect];    else    {        if ( self.checkMarkStyle == SSCheckMarkStyleOpenCircle )            [self drawRectOpenCircle:rect];        else if ( self.checkMarkStyle == SSCheckMarkStyleGrayedOut )            [self drawRectGrayedOut:rect];    }}- (void) setChecked:(bool)checked{    _checked = checked;    [self setNeedsDisplay];}- (void) setCheckMarkStyle:(SSCheckMarkStyle)checkMarkStyle{    _checkMarkStyle = checkMarkStyle;    [self setNeedsDisplay];}- (void) drawRectChecked: (CGRect) rect{    //// General Declarations    CGContextRef context = UIGraphicsGetCurrentContext();    //// Color Declarations    UIColor* checkmarkBlue2 = [UIColor colorWithRed: 0.078 green: 0.435 blue: 0.875 alpha: 1];    //// Shadow Declarations    UIColor* shadow2 = [UIColor blackColor];    CGSize shadow2Offset = CGSizeMake(0.1, -0.1);    CGFloat shadow2BlurRadius = 2.5;    //// Frames    CGRect frame = self.bounds;    //// Subframes    CGRect group = CGRectMake(CGRectGetMinX(frame) + 3, CGRectGetMinY(frame) + 3, CGRectGetWidth(frame) - 6, CGRectGetHeight(frame) - 6);    //// Group    {        //// CheckedOval Drawing        UIBezierPath* checkedOvalPath = [UIBezierPath bezierPathWithOvalInRect: CGRectMake(CGRectGetMinX(group) + floor(CGRectGetWidth(group) * 0.00000 + 0.5), CGRectGetMinY(group) + floor(CGRectGetHeight(group) * 0.00000 + 0.5), floor(CGRectGetWidth(group) * 1.00000 + 0.5) - floor(CGRectGetWidth(group) * 0.00000 + 0.5), floor(CGRectGetHeight(group) * 1.00000 + 0.5) - floor(CGRectGetHeight(group) * 0.00000 + 0.5))];        CGContextSaveGState(context);        CGContextSetShadowWithColor(context, shadow2Offset, shadow2BlurRadius, shadow2.CGColor);        [checkmarkBlue2 setFill];        [checkedOvalPath fill];        CGContextRestoreGState(context);        [[UIColor whiteColor] setStroke];        checkedOvalPath.lineWidth = 1;        [checkedOvalPath stroke];        //// Bezier Drawing        UIBezierPath* bezierPath = [UIBezierPath bezierPath];        [bezierPath moveToPoint: CGPointMake(CGRectGetMinX(group) + 0.27083 * CGRectGetWidth(group), CGRectGetMinY(group) + 0.54167 * CGRectGetHeight(group))];        [bezierPath addLineToPoint: CGPointMake(CGRectGetMinX(group) + 0.41667 * CGRectGetWidth(group), CGRectGetMinY(group) + 0.68750 * CGRectGetHeight(group))];        [bezierPath addLineToPoint: CGPointMake(CGRectGetMinX(group) + 0.75000 * CGRectGetWidth(group), CGRectGetMinY(group) + 0.35417 * CGRectGetHeight(group))];        bezierPath.lineCapStyle = kCGLineCapSquare;        [[UIColor whiteColor] setStroke];        bezierPath.lineWidth = 1.3;        [bezierPath stroke];    }}- (void) drawRectGrayedOut: (CGRect) rect{    //// General Declarations    CGContextRef context = UIGraphicsGetCurrentContext();    //// Color Declarations    UIColor* grayTranslucent = [UIColor colorWithRed: 1 green: 1 blue: 1 alpha: 0.6];    //// Shadow Declarations    UIColor* shadow2 = [UIColor blackColor];    CGSize shadow2Offset = CGSizeMake(0.1, -0.1);    CGFloat shadow2BlurRadius = 2.5;    //// Frames    CGRect frame = self.bounds;    //// Subframes    CGRect group = CGRectMake(CGRectGetMinX(frame) + 3, CGRectGetMinY(frame) + 3, CGRectGetWidth(frame) - 6, CGRectGetHeight(frame) - 6);    //// Group    {        //// UncheckedOval Drawing        UIBezierPath* uncheckedOvalPath = [UIBezierPath bezierPathWithOvalInRect: CGRectMake(CGRectGetMinX(group) + floor(CGRectGetWidth(group) * 0.00000 + 0.5), CGRectGetMinY(group) + floor(CGRectGetHeight(group) * 0.00000 + 0.5), floor(CGRectGetWidth(group) * 1.00000 + 0.5) - floor(CGRectGetWidth(group) * 0.00000 + 0.5), floor(CGRectGetHeight(group) * 1.00000 + 0.5) - floor(CGRectGetHeight(group) * 0.00000 + 0.5))];        CGContextSaveGState(context);        CGContextSetShadowWithColor(context, shadow2Offset, shadow2BlurRadius, shadow2.CGColor);        [grayTranslucent setFill];        [uncheckedOvalPath fill];        CGContextRestoreGState(context);        [[UIColor whiteColor] setStroke];        uncheckedOvalPath.lineWidth = 1;        [uncheckedOvalPath stroke];        //// Bezier Drawing        UIBezierPath* bezierPath = [UIBezierPath bezierPath];        [bezierPath moveToPoint: CGPointMake(CGRectGetMinX(group) + 0.27083 * CGRectGetWidth(group), CGRectGetMinY(group) + 0.54167 * CGRectGetHeight(group))];        [bezierPath addLineToPoint: CGPointMake(CGRectGetMinX(group) + 0.41667 * CGRectGetWidth(group), CGRectGetMinY(group) + 0.68750 * CGRectGetHeight(group))];        [bezierPath addLineToPoint: CGPointMake(CGRectGetMinX(group) + 0.75000 * CGRectGetWidth(group), CGRectGetMinY(group) + 0.35417 * CGRectGetHeight(group))];        bezierPath.lineCapStyle = kCGLineCapSquare;        [[UIColor whiteColor] setStroke];        bezierPath.lineWidth = 1.3;        [bezierPath stroke];    }}- (void) drawRectOpenCircle: (CGRect) rect{    //// General Declarations    CGContextRef context = UIGraphicsGetCurrentContext();    //// Shadow Declarations    UIColor* shadow = [UIColor blackColor];    CGSize shadowOffset = CGSizeMake(0.1, -0.1);    CGFloat shadowBlurRadius = 0.5;    UIColor* shadow2 = [UIColor blackColor];    CGSize shadow2Offset = CGSizeMake(0.1, -0.1);    CGFloat shadow2BlurRadius = 2.5;    //// Frames    CGRect frame = self.bounds;    //// Subframes    CGRect group = CGRectMake(CGRectGetMinX(frame) + 3, CGRectGetMinY(frame) + 3, CGRectGetWidth(frame) - 6, CGRectGetHeight(frame) - 6);    //// Group    {        //// EmptyOval Drawing        UIBezierPath* emptyOvalPath = [UIBezierPath bezierPathWithOvalInRect: CGRectMake(CGRectGetMinX(group) + floor(CGRectGetWidth(group) * 0.00000 + 0.5), CGRectGetMinY(group) + floor(CGRectGetHeight(group) * 0.00000 + 0.5), floor(CGRectGetWidth(group) * 1.00000 + 0.5) - floor(CGRectGetWidth(group) * 0.00000 + 0.5), floor(CGRectGetHeight(group) * 1.00000 + 0.5) - floor(CGRectGetHeight(group) * 0.00000 + 0.5))];        CGContextSaveGState(context);        CGContextSetShadowWithColor(context, shadow2Offset, shadow2BlurRadius, shadow2.CGColor);        CGContextRestoreGState(context);        CGContextSaveGState(context);        CGContextSetShadowWithColor(context, shadowOffset, shadowBlurRadius, shadow.CGColor);        [[UIColor whiteColor] setStroke];        emptyOvalPath.lineWidth = 1;        [emptyOvalPath stroke];        CGContextRestoreGState(context);    }}@end

Swift 3 version of Chris Vasellis' nice solution:

import UIKitenum SSCheckMarkStyle : UInt {    case OpenCircle    case GrayedOut}class SSCheckMark: UIView {private var checkedBool: Bool = false// choose whether you like open or grayed out non-selected itemsprivate var checkMarkStyleReal: SSCheckMarkStyle=SSCheckMarkStyle.GrayedOutvar checked: Bool {    get {        return self.checkedBool    }    set(checked) {        self.checkedBool = checked        self.setNeedsDisplay()    }}var checkMarkStyle: SSCheckMarkStyle {    get {        return self.checkMarkStyleReal    }    set(checkMarkStyle) {        self.checkMarkStyleReal = checkMarkStyle        self.setNeedsDisplay()    }}override func draw(_ rect: CGRect) {    super.draw(rect)    if self.checked {        self.drawRectChecked(rect: rect)    } else {        if self.checkMarkStyle == SSCheckMarkStyle.OpenCircle {            self.drawRectOpenCircle(rect: rect)        } else if self.checkMarkStyle == SSCheckMarkStyle.GrayedOut {            self.drawRectGrayedOut(rect: rect)        }    }}func drawRectChecked(rect: CGRect) {    let context = UIGraphicsGetCurrentContext()    let checkmarkBlue2 = UIColor(red: 0.078, green: 0.435, blue: 0.875, alpha: 1)    let shadow2 = UIColor.black    let shadow2Offset = CGSize(width: 0.1, height: -0.1)    let shadow2BlurRadius = 2.5    let frame = self.bounds    let group = CGRect(x: frame.minX + 3, y: frame.minY + 3, width: frame.width - 6, height: frame.height - 6)    let checkedOvalPath = UIBezierPath(ovalIn: CGRect(x: group.minX + floor(group.width * 0.00000 + 0.5), y: group.minY + floor(group.height * 0.00000 + 0.5), width: floor(group.width * 1.00000 + 0.5) - floor(group.width * 0.00000 + 0.5), height: floor(group.height * 1.00000 + 0.5) - floor(group.height * 0.00000 + 0.5)))    context!.saveGState()    context!.setShadow(offset: shadow2Offset, blur: CGFloat(shadow2BlurRadius), color: shadow2.cgColor)    checkmarkBlue2.setFill()    checkedOvalPath.fill()    context!.restoreGState()    UIColor.white.setStroke()    checkedOvalPath.lineWidth = 1    checkedOvalPath.stroke()    let bezierPath = UIBezierPath()    bezierPath.move(to: CGPoint(x: group.minX + 0.27083 * group.width, y: group.minY + 0.54167 * group.height))    bezierPath.addLine(to: CGPoint(x: group.minX + 0.41667 * group.width, y: group.minY + 0.68750 * group.height))    bezierPath.addLine(to: CGPoint(x: group.minX + 0.75000 * group.width, y: group.minY + 0.35417 * group.height))    bezierPath.lineCapStyle = CGLineCap.square    UIColor.white.setStroke()    bezierPath.lineWidth = 1.3    bezierPath.stroke()}func drawRectGrayedOut(rect: CGRect) {    let context = UIGraphicsGetCurrentContext()    let grayTranslucent = UIColor(red: 1, green: 1, blue: 1, alpha: 0.6)    let shadow2 = UIColor.black    let shadow2Offset = CGSize(width: 0.1, height: -0.1)    let shadow2BlurRadius = 2.5    let frame = self.bounds    let group = CGRect(x: frame.minX + 3, y: frame.minY + 3, width: frame.width - 6, height: frame.height - 6)    let uncheckedOvalPath = UIBezierPath(ovalIn: CGRect(x: group.minX + floor(group.width * 0.00000 + 0.5), y: group.minY + floor(group.height * 0.00000 + 0.5), width: floor(group.width * 1.00000 + 0.5) - floor(group.width * 0.00000 + 0.5), height: floor(group.height * 1.00000 + 0.5) - floor(group.height * 0.00000 + 0.5)))    context!.saveGState()    context!.setShadow(offset: shadow2Offset, blur: CGFloat(shadow2BlurRadius), color: shadow2.cgColor)    grayTranslucent.setFill()    uncheckedOvalPath.fill()    context!.restoreGState()    UIColor.white.setStroke()    uncheckedOvalPath.lineWidth = 1    uncheckedOvalPath.stroke()    let bezierPath = UIBezierPath()    bezierPath.move(to: CGPoint(x: group.minX + 0.27083 * group.width, y: group.minY + 0.54167 * group.height))    bezierPath.addLine(to: CGPoint(x: group.minX + 0.41667 * group.width, y: group.minY + 0.68750 * group.height))    bezierPath.addLine(to: CGPoint(x: group.minX + 0.75000 * group.width, y: group.minY + 0.35417 * group.height))    bezierPath.lineCapStyle = CGLineCap.square    UIColor.white.setStroke()    bezierPath.lineWidth = 1.3    bezierPath.stroke()}func drawRectOpenCircle(rect: CGRect) {    let context = UIGraphicsGetCurrentContext()    let shadow = UIColor.black    let shadowOffset = CGSize(width: 0.1, height: -0.1)    let shadowBlurRadius = 0.5    let shadow2 = UIColor.black    let shadow2Offset = CGSize(width: 0.1, height: -0.1)    let shadow2BlurRadius = 2.5    let frame = self.bounds    let group = CGRect(x: frame.minX + 3, y: frame.minY + 3, width: frame.width - 6, height: frame.height - 6)    let emptyOvalPath = UIBezierPath(ovalIn: CGRect(x: group.minX + floor(group.width * 0.00000 + 0.5), y: group.minY + floor(group.height * 0.00000 + 0.5), width: floor(group.width * 1.00000 + 0.5) - floor(group.width * 0.00000 + 0.5), height: floor(group.height * 1.00000 + 0.5) - floor(group.height * 0.00000 + 0.5)))    context!.saveGState()    context!.setShadow(offset: shadow2Offset, blur: CGFloat(shadow2BlurRadius), color: shadow2.cgColor)    context!.restoreGState()    context!.saveGState()    context!.setShadow(offset: shadowOffset, blur: CGFloat(shadowBlurRadius), color: shadow.cgColor)    UIColor.white.setStroke()    emptyOvalPath.lineWidth = 1    emptyOvalPath.stroke()    context!.restoreGState()}}

To use it in your code, create a file called SSCheckMark.swift with the above contents, and assign it to your View. I use it in CollectionViewCells, for which I have created a custom class (code simplified heavily):

class myCollectionViewCell: UICollectionViewCell {    var checkmarkView: SSCheckMark!    override init(frame: CGRect) {        super.init(frame: frame)        checkmarkView = SSCheckMark(frame: CGRect(x: frame.width-40, y: 10, width: 35, height: 35))        checkmarkView.backgroundColor = UIColor.white        myView.addSubview(checkmarkView)    }}

And in my UIViewController, I have this:

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {    let cell:ProductCollectionViewCell = collectionView.dequeueReusableCell(withReuseIdentifier: "cellID", for: indexPath) as! myCollectionViewCell    cell.checkmarkView.checked = myBoolValue    return cell}

One possibility is creating a UIView that draws concentric circles, then a checkmark character from your font of choice. To find checkmark characters, go to Edit > Special Characters within Xcode (or any other application with that menu item), and search for "check". When you select one of the search results, you'll see font variations at the bottom right.