7cc3928a19
Via nfarina/calloutview#84, SMCalloutView is now accessible. Activating a focused annotation now shows its callout view and focuses its left accessory view, if present, or the title view. There is a “return to map” accessibility element for dismissing the callout view and restoring focus to the annotation on the map.
106 lines
3.3 KiB
Objective-C
106 lines
3.3 KiB
Objective-C
#import "MBXCustomCalloutView.h"
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static CGFloat const tipHeight = 10.0;
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static CGFloat const tipWidth = 10.0;
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@interface MBXCustomCalloutView ()
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@property (strong, nonatomic) UILabel *mainLabel;
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@end
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@implementation MBXCustomCalloutView {
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id <MGLAnnotation> _representedObject;
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UIView *_leftAccessoryView;
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UIView *_rightAccessoryView;
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__weak id <MGLCalloutViewDelegate> _delegate;
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}
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@synthesize representedObject = _representedObject;
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@synthesize leftAccessoryView = _leftAccessoryView;
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@synthesize rightAccessoryView = _rightAccessoryView;
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@synthesize delegate = _delegate;
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- (instancetype)initWithFrame:(CGRect)frame
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{
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self = [super initWithFrame:frame];
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if (self)
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{
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self.backgroundColor = [UIColor clearColor];
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_mainLabel = [[UILabel alloc] initWithFrame: CGRectZero];
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_mainLabel.backgroundColor = [UIColor clearColor];
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[self addSubview: _mainLabel];
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}
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return self;
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}
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#pragma mark - API
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- (void)presentCalloutFromRect:(CGRect)rect inView:(UIView *)view constrainedToView:(UIView *)constrainedView animated:(BOOL)animated
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{
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if ([self.delegate respondsToSelector:@selector(calloutViewWillAppear:)])
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{
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[self.delegate performSelector:@selector(calloutViewWillAppear:) withObject:self];
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}
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[view addSubview:self];
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// prepare title label
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if ([self.representedObject respondsToSelector:@selector(title)])
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{
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self.mainLabel.text = self.representedObject.title;
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[self.mainLabel sizeToFit];
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}
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// prepare our frame
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CGFloat frameWidth = self.mainLabel.bounds.size.width;
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CGFloat frameHeight = self.mainLabel.bounds.size.height * 2.0;
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CGFloat frameOriginX = rect.origin.x + (rect.size.width/2.0) - (frameWidth/2.0);
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CGFloat frameOriginY = rect.origin.y - frameHeight;
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self.frame = CGRectMake(frameOriginX, frameOriginY,
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frameWidth, frameHeight);
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if ([self.delegate respondsToSelector:@selector(calloutViewDidAppear:)])
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{
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[self.delegate performSelector:@selector(calloutViewDidAppear:) withObject:self];
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}
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}
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- (void)dismissCalloutAnimated:(BOOL)animated
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{
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if (self.superview)
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[self removeFromSuperview];
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}
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#pragma mark - internals
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- (void)drawRect:(CGRect)rect
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{
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UIColor *fillColor = [UIColor colorWithWhite:0.7 alpha:1.0];
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CGFloat tipLeft = rect.origin.x + (rect.size.width / 2.0) - (tipWidth / 2.0);
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CGPoint tipBottom = CGPointMake(rect.origin.x + (rect.size.width / 2.0), rect.origin.y +rect.size.height);
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CGFloat heightWithoutTip = rect.size.height - tipHeight;
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// draw the white background with tip
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CGContextRef ctxt = UIGraphicsGetCurrentContext();
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CGMutablePathRef tipPath = CGPathCreateMutable();
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CGPathMoveToPoint(tipPath, NULL, 0, 0);
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CGPathAddLineToPoint(tipPath, NULL, 0, heightWithoutTip);
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CGPathAddLineToPoint(tipPath, NULL, tipLeft, heightWithoutTip);
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CGPathAddLineToPoint(tipPath, NULL, tipBottom.x, tipBottom.y);
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CGPathAddLineToPoint(tipPath, NULL, tipLeft + tipWidth, heightWithoutTip);
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CGPathAddLineToPoint(tipPath, NULL, CGRectGetWidth(rect), heightWithoutTip);
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CGPathAddLineToPoint(tipPath, NULL, CGRectGetWidth(rect), 0);
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CGPathCloseSubpath(tipPath);
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[fillColor setFill];
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CGContextAddPath(ctxt, tipPath);
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CGContextFillPath(ctxt);
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CGPathRelease(tipPath);
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}
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@end
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