iOS自定义注释：注释引脚下方的视图 [英] iOS Custom Annotation: A view below the annotation pin
本文介绍了iOS自定义注释：注释引脚下方的视图的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我需要用我的自定义注释视图替换默认注释视图。
我需要做以下事情：
- 自定义注释视图，其中嵌入了图像视图。
- 下面的视图，其中包含标签。
有关更多说明，请参阅图片：
在上图中，我需要在白色空间放置一个图像视图，你可以在循环形式的图像中看到，接下来我还需要添加一个视图，其中包含一个标签，我可以在其上设置任何文本，如我，朋友等...
所以，为此，我搜索了有关堆栈溢出的问题，但没有得到我的答案。我不希望它在呼出时，我只是想在渲染地图时将其简单地作为注释。我已经尝试为此制作一个自定义类，但不知道如何处理这个问题。
任何帮助都将受到高度赞赏
解决方案
您可以创建自己的注释视图：
@import MapKit;
@interface CustomAnnotationView：MKAnnotationView
@end
@interface CustomAnnotationView（）
@property（nonatomic）CGSize textSize;
@property（nonatomic）CGSize textBubbleSize;
@property（非原子，弱）UILabel *标签;
@property（非原子）CGFloat lineWidth;
@property（非原子）CGFloat pinRadius;
@property（非原子）CGFloat pinHeight;
@property（非原子，强）UIBezierPath * pinPath;
@property（非原子，强）UIBezierPath * textBubblePath;
@end
@implementation CustomAnnotationView
- （instancetype）initWithAnnotation：（id< MKAnnotation>）annotation reuseIdentifier：（NSString *）reuseIdentifier {
self = [super initWithAnnotation：annotation reuseIdentifier：reuseIdentifier];
if（self）{
self.lineWidth = 1.0;
self.pinHeight = 40;
self.pinRadius = 15;
UILabel * label = [[UILabel alloc] init];
label.textAlignment = NSTextAlignmentCenter;
label.font = [UIFont preferredFontForTextStyle：UIFontTextStyleCallout];
label.textColor = [UIColor whiteColor];
[self addSubview：label];
self.label = label;
[self adjustLabelWidth：annotation];
self.opaque = false;
}
返回自我;
}
- （void）setAnnotation：（id< MKAnnotation>）注释{
[super setAnnotation：annotation];
if（annotation）[self adjustLabelWidth：annotation];
}
- （void）adjustLabelWidth：（id< MKAnnotation>）注释{
NSString * title = [注释标题];
NSDictionary * attributes = @ {NSFontAttributeName：self.label.font};
self.textSize = [title sizeWithAttributes：attributes];
CGFloat delta = self.textSize.height *（1.0 - sinf（M_PI_4））* 0.55;
self.textBubbleSize = CGSizeMake（self.textSize.width + delta * 2，self.textSize.height + delta * 2）;
self.label.frame = CGRectMake（0，self.pinHeight，self.textBubbleSize.width，self.textBubbleSize.height）;
self.label.text = title;
self.frame = CGRectMake（0,0，self.textBubbleSize.width，self.pinHeight + self.textBubbleSize.height）;
self.centerOffset = CGPointMake（0，self.frame.size.height / 2.0 - self.pinHeight）;
}
- （void）drawRect：（CGRect）rect {
CGFloat radius = self.pinRadius - self.lineWidth / 2.0;
CGPoint startPoint = CGPointMake（self.textBubbleSize.width / 2.0，self.pinHeight）;
CGPoint center = CGPointMake（self.textBubbleSize.width / 2，self.pinRadius）;
CGPoint nextPoint;
// pin
self.pinPath = [UIBezierPath bezierPath];
[self.pinPath moveToPoint：startPoint];
nextPoint = CGPointMake（self.textBubbleSize.width / 2 - radius，self.pinRadius）;
[self.pinPath addCurveToPoint：nextPoint
controlPoint1：CGPointMake（startPoint.x，startPoint.y - （startPoint.y - nextPoint.y）/ 2.0）
controlPoint2：CGPointMake（nextPoint.x ，nextPoint.y +（startPoint.y - nextPoint.y）/ 2.0）];
[self.pinPath addArcWithCenter：center radius：radius startAngle：M_PI endAngle：0 clockwise：TRUE];
nextPoint = startPoint;
startPoint = self.pinPath.currentPoint;
[self.pinPath addCurveToPoint：nextPoint
controlPoint1：CGPointMake（startPoint.x，startPoint.y - （startPoint.y - nextPoint.y）/ 2.0）
controlPoint2：CGPointMake（nextPoint.x ，nextPoint.y +（startPoint.y - nextPoint.y）/ 2.0）];
[[UIColor blackColor] setStroke];
[[UIColor colorWithRed：0.0 green：0.5 blue：1.0 alpha：0.8] setFill];
self.pinPath.lineWidth = self.lineWidth;
[self.pinPath fill];
[self.pinPath stroke];
[self.pinPath closePath];
//标签周围的泡沫
if（[self.annotation.title length]> 0）{
self.textBubblePath = [UIBezierPath bezierPath];
CGRect bubbleRect = CGRectInset（CGRectMake（0，self.pinHeight，self.textBubbleSize.width，self.textBubbleSize.height），self.lineWidth / 2，self.lineWidth / 2）;
self.textBubblePath = [UIBezierPath bezierPathWithRoundedRect：bubbleRect
cornerRadius：bubbleRect.size.height / 2];
self.textBubblePath.lineWidth = self.lineWidth;
[self.textBubblePath fill];
[self.textBubblePath stroke];
} else {
self.textBubblePath = nil;
}
//中心白点
self.pinPath = [UIBezierPath bezierPathWithArcCenter：中心半径：radius / 3.0 startAngle：0 endAngle：顺时针M_PI * 2.0：真正];
self.pinPath.lineWidth = self.lineWidth;
[[UIColor whiteColor] setFill];
[self.pinPath fill];
}
- （UIView *）hitTest：（CGPoint）指向withEvent :(可空的UIEvent *）事件{
if（[self.pinPath containsPoint：point] || [ self.textBubblePath containsPoint：point]）
return self;
返回零;
}
@end
产生的结果如下： / p>
显然，您可以根据自己的心情自定义内容，但它说明了基本的想法：写一个 MKAnnotationView 子类，它重写 initWithAnnotation：reuseIdentifier：并实现你自己的 drawRect 。
I need to replace the default annotation view with my custom annotation view.
I need the do following things:
- Custom Annotation view with an image view embedded in it.
- A view below it which contains a label in it.
For more clarification see the image:
In the above image I need to place an image view in the white space which you can see in the image in circular form, next I also need to add a view which contains a label on which I can set any text like me, friends, etc...
So, for this I searched number of questions on stack overflow but didn't got my answer. I don't want it on call out, I just want it simply as annotation when map is rendered. I have tried to make a custom class for this but not getting any idea how to deal with this.
Any help will be highly appreciated
解决方案
You could just create your own annotation view:
@import MapKit;
@interface CustomAnnotationView : MKAnnotationView
@end
@interface CustomAnnotationView ()
@property (nonatomic) CGSize textSize;
@property (nonatomic) CGSize textBubbleSize;
@property (nonatomic, weak) UILabel *label;
@property (nonatomic) CGFloat lineWidth;
@property (nonatomic) CGFloat pinRadius;
@property (nonatomic) CGFloat pinHeight;
@property (nonatomic, strong) UIBezierPath *pinPath;
@property (nonatomic, strong) UIBezierPath *textBubblePath;
@end
@implementation CustomAnnotationView
- (instancetype)initWithAnnotation:(id<MKAnnotation>)annotation reuseIdentifier:(NSString *)reuseIdentifier {
self = [super initWithAnnotation:annotation reuseIdentifier:reuseIdentifier];
if (self) {
self.lineWidth = 1.0;
self.pinHeight = 40;
self.pinRadius = 15;
UILabel *label = [[UILabel alloc] init];
label.textAlignment = NSTextAlignmentCenter;
label.font = [UIFont preferredFontForTextStyle:UIFontTextStyleCallout];
label.textColor = [UIColor whiteColor];
[self addSubview:label];
self.label = label;
[self adjustLabelWidth:annotation];
self.opaque = false;
}
return self;
}
- (void)setAnnotation:(id<MKAnnotation>)annotation {
[super setAnnotation:annotation];
if (annotation) [self adjustLabelWidth:annotation];
}
- (void)adjustLabelWidth:(id<MKAnnotation>)annotation {
NSString *title = [annotation title];
NSDictionary *attributes = @{NSFontAttributeName : self.label.font};
self.textSize = [title sizeWithAttributes:attributes];
CGFloat delta = self.textSize.height * (1.0 - sinf(M_PI_4)) * 0.55;
self.textBubbleSize = CGSizeMake(self.textSize.width + delta * 2, self.textSize.height + delta * 2);
self.label.frame = CGRectMake(0, self.pinHeight, self.textBubbleSize.width, self.textBubbleSize.height);
self.label.text = title;
self.frame = CGRectMake(0, 0, self.textBubbleSize.width, self.pinHeight + self.textBubbleSize.height);
self.centerOffset = CGPointMake(0, self.frame.size.height / 2.0 - self.pinHeight);
}
- (void)drawRect:(CGRect)rect {
CGFloat radius = self.pinRadius - self.lineWidth / 2.0;
CGPoint startPoint = CGPointMake(self.textBubbleSize.width / 2.0, self.pinHeight);
CGPoint center = CGPointMake(self.textBubbleSize.width / 2, self.pinRadius);
CGPoint nextPoint;
// pin
self.pinPath = [UIBezierPath bezierPath];
[self.pinPath moveToPoint:startPoint];
nextPoint = CGPointMake(self.textBubbleSize.width / 2 - radius, self.pinRadius);
[self.pinPath addCurveToPoint:nextPoint
controlPoint1:CGPointMake(startPoint.x, startPoint.y - (startPoint.y - nextPoint.y) / 2.0)
controlPoint2:CGPointMake(nextPoint.x, nextPoint.y + (startPoint.y - nextPoint.y) / 2.0)];
[self.pinPath addArcWithCenter:center radius:radius startAngle:M_PI endAngle:0 clockwise:TRUE];
nextPoint = startPoint;
startPoint = self.pinPath.currentPoint;
[self.pinPath addCurveToPoint:nextPoint
controlPoint1:CGPointMake(startPoint.x, startPoint.y - (startPoint.y - nextPoint.y) / 2.0)
controlPoint2:CGPointMake(nextPoint.x, nextPoint.y + (startPoint.y - nextPoint.y) / 2.0)];
[[UIColor blackColor] setStroke];
[[UIColor colorWithRed:0.0 green:0.5 blue:1.0 alpha:0.8] setFill];
self.pinPath.lineWidth = self.lineWidth;
[self.pinPath fill];
[self.pinPath stroke];
[self.pinPath closePath];
// bubble around label
if ([self.annotation.title length] > 0) {
self.textBubblePath = [UIBezierPath bezierPath];
CGRect bubbleRect = CGRectInset(CGRectMake(0, self.pinHeight, self.textBubbleSize.width, self.textBubbleSize.height), self.lineWidth / 2, self.lineWidth / 2);
self.textBubblePath = [UIBezierPath bezierPathWithRoundedRect:bubbleRect
cornerRadius:bubbleRect.size.height / 2];
self.textBubblePath.lineWidth = self.lineWidth;
[self.textBubblePath fill];
[self.textBubblePath stroke];
} else {
self.textBubblePath = nil;
}
// center white dot
self.pinPath = [UIBezierPath bezierPathWithArcCenter:center radius:radius / 3.0 startAngle:0 endAngle:M_PI * 2.0 clockwise:TRUE];
self.pinPath.lineWidth = self.lineWidth;
[[UIColor whiteColor] setFill];
[self.pinPath fill];
}
- (UIView *)hitTest:(CGPoint)point withEvent:(nullable UIEvent *)event {
if ([self.pinPath containsPoint:point] || [self.textBubblePath containsPoint:point])
return self;
return nil;
}
@end
That yields something like:
Clearly, you can customize this to your heart's content, but it illustrates the basic idea: Write a MKAnnotationView subclass that overrides initWithAnnotation:reuseIdentifier: and implement your own drawRect.
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