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#import "CustomCalloutView.h"
// Set defaults for custom tip drawing
static CGFloat const tipHeight = 10.0;
static CGFloat const tipWidth = 20.0;
@interface CustomCalloutView ()
@property (strong, nonatomic) UIButton *mainBody;
@end
@implementation CustomCalloutView {
id <MGLAnnotation> _representedObject;
__unused UIView *_leftAccessoryView;/* unused */
__unused UIView *_rightAccessoryView;/* unused */
__weak id <MGLCalloutViewDelegate> _delegate;
}
@synthesize representedObject = _representedObject;
@synthesize leftAccessoryView = _leftAccessoryView;/* unused */
@synthesize rightAccessoryView = _rightAccessoryView;/* unused */
@synthesize delegate = _delegate;
- (instancetype)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self)
{
self.backgroundColor = [UIColor clearColor];
// Create and add a subview to hold the callout’s text
UIButton *mainBody = [UIButton buttonWithType:UIButtonTypeSystem];
mainBody.backgroundColor = [self backgroundColorForCallout];
mainBody.tintColor = [UIColor whiteColor];
mainBody.contentEdgeInsets = UIEdgeInsetsMake(10.0, 10.0, 10.0, 10.0);
mainBody.layer.cornerRadius = 4.0;
self.mainBody = mainBody;
[self addSubview:self.mainBody];
}
return self;
}
#pragma mark - MGLCalloutView API
- (void)presentCalloutFromRect:(CGRect)rect inView:(UIView *)view constrainedToView:(UIView *)constrainedView animated:(BOOL)animated
{
// Do not show a callout if there is no title set for the annotation
if (![self.representedObject respondsToSelector:@selector(title)])
{
return;
}
[view addSubview:self];
// Prepare title label
[self.mainBody setTitle:self.representedObject.title forState:UIControlStateNormal];
[self.mainBody sizeToFit];
if ([self isCalloutTappable])
{
// Handle taps and eventually try to send them to the delegate (usually the map view)
[self.mainBody addTarget:self action:@selector(calloutTapped) forControlEvents:UIControlEventTouchUpInside];
}
else
{
// Disable tapping and highlighting
self.mainBody.userInteractionEnabled = NO;
}
// Prepare our frame, adding extra space at the bottom for the tip
CGFloat frameWidth = self.mainBody.bounds.size.width;
CGFloat frameHeight = self.mainBody.bounds.size.height + tipHeight;
CGFloat frameOriginX = rect.origin.x + (rect.size.width/2.0) - (frameWidth/2.0);
CGFloat frameOriginY = rect.origin.y - frameHeight;
self.frame = CGRectMake(frameOriginX, frameOriginY,
frameWidth, frameHeight);
if (animated)
{
self.alpha = 0.0;
[UIView animateWithDuration:0.2 animations:^{
self.alpha = 1.0;
}];
}
}
- (void)dismissCalloutAnimated:(BOOL)animated
{
if (self.superview)
{
if (animated)
{
[UIView animateWithDuration:0.2 animations:^{
self.alpha = 0.0;
} completion:^(BOOL finished) {
[self removeFromSuperview];
}];
}
else
{
[self removeFromSuperview];
}
}
}
#pragma mark - Callout interaction handlers
- (BOOL)isCalloutTappable
{
if ([self.delegate respondsToSelector:@selector(calloutViewShouldHighlight:)]) {
return [self.delegate performSelector:@selector(calloutViewShouldHighlight:) withObject:self];
}
return NO;
}
- (void)calloutTapped
{
if ([self isCalloutTappable] && [self.delegate respondsToSelector:@selector(calloutViewTapped:)])
{
[self.delegate performSelector:@selector(calloutViewTapped:) withObject:self];
}
}
#pragma mark - Custom view styling
- (UIColor *)backgroundColorForCallout
{
return [UIColor darkGrayColor];
}
- (void)drawRect:(CGRect)rect
{
// Draw the pointed tip at the bottom
UIColor *fillColor = [self backgroundColorForCallout];
CGFloat tipLeft = rect.origin.x + (rect.size.width / 2.0) - (tipWidth / 2.0);
CGPoint tipBottom = CGPointMake(rect.origin.x + (rect.size.width / 2.0), rect.origin.y + rect.size.height);
CGFloat heightWithoutTip = rect.size.height - tipHeight;
CGContextRef currentContext = UIGraphicsGetCurrentContext();
CGMutablePathRef tipPath = CGPathCreateMutable();
CGPathMoveToPoint(tipPath, NULL, tipLeft, heightWithoutTip);
CGPathAddLineToPoint(tipPath, NULL, tipBottom.x, tipBottom.y);
CGPathAddLineToPoint(tipPath, NULL, tipLeft + tipWidth, heightWithoutTip);
CGPathCloseSubpath(tipPath);
[fillColor setFill];
CGContextAddPath(currentContext, tipPath);
CGContextFillPath(currentContext);
CGPathRelease(tipPath);
}
@end
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