iOS自定义标注：在标注图钉下面的视图

Question

iOS自定义标注：在标注图钉下面的视图

iosobjective-cmapkitmapkitannotation

3

我需要用自定义注释视图替换默认的注释视图。

我需要做以下事情：

自定义带有图像视图的注释视图。
在其下方添加一个包含标签的视图。

为了更清楚，请参见下面的图片：

样例Pin

在上面的图片中，我需要在圆形的白色空间中放置一个图像视图。接下来，我还需要添加一个包含标签的视图，在该标签上可以设置任何文本，如me，friends等...

因此，我在stackoverflow上搜索了许多问题，但没有找到答案。我不想要call out，我只想在地图呈现时简单地作为注释。我尝试过为此创建一个自定义类，但是不知道如何处理它。

非常感谢您的任何帮助。

- iYoung

使用以下网址https://dev59.com/f2w05IYBdhLWcg3w11W0，在图像上添加文本，然后将该输出图像用作注释标记。 - aBilal17

这个问题与自定义注解有什么关联？ - iYoung

你想要创建带有文本的图像，对吗？ - aBilal17

我在谈论的是引脚而不是标注视图。 - iYoung

让我们在聊天中继续这个讨论。 - aBilal17

显示剩余2条评论

1个回答

网页内容由stack overflow 提供, 点击上面的

可以查看英文原文，
原文链接

- Rob · Accepted Answer

你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 (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

这将产生类似于以下内容：

显然，您可以根据自己的需要对其进行自定义，但它说明了基本思想：编写一个MKAnnotationView子类，覆盖initWithAnnotation:reuseIdentifier:并实现自己的drawRect。