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@zoejessica
Created April 24, 2015 17:05
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Badged pin (eg for maps) using IB_Designable and IBInspectable
#import <UIKit/UIKit.h>
IB_DESIGNABLE @interface BadgedPin : UIView
@property (nonatomic, assign) IBInspectable CGFloat badgeDiameter;
@property (nonatomic, strong) IBInspectable UIColor *badgeColor;
@property (nonatomic, assign) IBInspectable CGFloat badgeStrokeWidth;
@property (nonatomic, strong) IBInspectable UIColor *fillColor;
@property (nonatomic, strong) IBInspectable NSString *imageName;
@end
#import "BadgedPin.h"
@interface BadgedPin()
@property (strong, nonatomic) UIImage *badge;
@property (strong, nonatomic) UIImage *underlyingImage;
@end
@implementation BadgedPin
- (void)drawRect:(CGRect)rect {
CGRect bounds = self.bounds;
CGFloat xposition = CGRectGetMaxX(bounds)/2 - self.badgeDiameter/2;
CGFloat yposition = CGRectGetMaxY(bounds)/2 - self.badgeDiameter/2;
CGPoint topLeftOfCentre = CGPointMake(xposition, yposition);
CGRect rectangle = CGRectMake(topLeftOfCentre.x, topLeftOfCentre.y, self.badgeDiameter, self.badgeDiameter);
UIBezierPath *outerCircle = [UIBezierPath bezierPathWithOvalInRect:rectangle];
[self.badgeColor setStroke];
[outerCircle setLineWidth:self.badgeStrokeWidth];
[self.fillColor setFill];
[outerCircle stroke];
[outerCircle fill];
[self.badge drawInRect:CGRectInset(rectangle, 4, 4)];
}
- (id)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
self.opaque = NO;
}
return self;
}
- (void)setImageName:(NSString *)imageName {
_imageName = imageName;
self.underlyingImage = [UIImage imageNamed:imageName];
[self updateBadgeWithImage:self.underlyingImage];
}
- (void)prepareForInterfaceBuilder {
NSBundle *currentBundle = [NSBundle bundleForClass:[self class]];
self.underlyingImage = [UIImage imageNamed:self.imageName inBundle:currentBundle compatibleWithTraitCollection:self.traitCollection];
[self updateBadgeWithImage:self.underlyingImage];
}
- (void)updateBadgeWithImage:(UIImage *)image {
self.badge = [self tintImage:image withColor:self.badgeColor];
}
- (void)setBadgeColor:(UIColor *)badgeColor {
_badgeColor = badgeColor;
[self updateBadgeWithImage:self.underlyingImage];
}
- (UIImage *)tintImage:(UIImage *)image withColor:(UIColor *)color {
// http://stackoverflow.com/questions/3514066/how-to-tint-a-transparent-png-image-in-iphone
UIGraphicsBeginImageContextWithOptions (image.size, NO, [[UIScreen mainScreen] scale]); // for correct resolution on retina, thanks @MobileVet
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextTranslateCTM(context, 0, image.size.height);
CGContextScaleCTM(context, 1.0, -1.0);
CGRect rect = CGRectMake(0, 0, image.size.width, image.size.height);
// image drawing code here
// draw tint color
CGContextSetBlendMode(context, kCGBlendModeNormal);
[color setFill];
CGContextFillRect(context, rect);
// mask by alpha values of original image
CGContextSetBlendMode(context, kCGBlendModeDestinationIn);
CGContextDrawImage(context, rect, image.CGImage);
UIImage *coloredImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return coloredImage;
}
@end
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