iOS针对MKMapView的自定义批注
首先,我使用主销来显示注释数组。一切正常 我的问题是:如何为注释创建自定义视图? 我不是指替换MKPinAnnotationView的图像iOS针对MKMapView的自定义批注,ios,mkmapview,mapkit,mkannotation,mkannotationview,Ios,Mkmapview,Mapkit,Mkannotation,Mkannotationview,首先,我使用主销来显示注释数组。一切正常 我的问题是:如何为注释创建自定义视图? 我不是指替换MKPinAnnotationView的图像 if (annotationView == nil) { annotationView = [[MKPinAnnotationView alloc]initWithAnnotation:annotation reuseIdentifier:@"cluster"]; annotationV
if (annotationView == nil) {
annotationView = [[MKPinAnnotationView alloc]initWithAnnotation:annotation reuseIdentifier:@"cluster"];
annotationView.canShowCallout = YES;
annotationView.image = [UIImage imageNamed:@"map_cluster"];
}
有了这个,我只能用图像替换默认pin。但这并不是我所需要的全部
我来自Android背景,通过将布局膨胀为集群(iOS中的又称注释)解决了这个问题。在这个XML布局中,我放置了一个容器(白色框架)、一张图片和一个计数器。
结果可以在下图中看到:
我如何在iOS中做到这一点?
提前感谢您的建议 在这里,您可以找到如何创建自定义批注:
如果你有任何问题,你可以问我:)反应很晚,但我想其他人还是会感兴趣的 在MKAnnotationView子类中: 首先,定义一些维度:
#define ckImageHeight 65
#define ckImageWidth 55
#define kBorder 5
然后定义注释视图的框架:
self.frame = CGRectMake(0, 0, ckImageWidth, ckImageHeight);
如果希望背景是图像而不仅仅是颜色:
self.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"map_checkin"]];
然后为图像创建一个占位符
CGRect checkInPictureRect = CGRectMake(kBorder, kBorder, ckImageWidth - 9 , ckImageWidth - 9);
UIView *checkInPictureView = [[UIView alloc]initWithFrame:checkInPictureRect];
然后,乐趣开始了:
// Crop image
UIImage *croppedImage = [ImageHelper centerCropImage:image];
// Resize image
CGSize checkInPictureSize = CGSizeMake(checkInPictureRect.size.width*1.5, checkInPictureRect.size.height*1.5);
UIGraphicsBeginImageContext(checkInPictureSize);
[croppedImage drawInRect:CGRectMake(0, 0, checkInPictureRect.size.width*1.5, checkInPictureRect.size.height*1.5)];
UIImage* resizedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageView *imageView = [[UIImageView alloc] initWithImage:resizedImage];
imageView.frame = checkInPictureView.bounds;
[checkInPictureView addSubview:imageView];
[self addSubview:checkInPictureView];
// Counter
UIView *counterView = [[UIView alloc]initWithFrame:CGRectMake(45, -2, 15, 15)];
counterView.opaque = YES;
(checkIn.isNow) ? [counterView setBackgroundColor:[UIColor enloopBlue]] : [counterView setBackgroundColor:[UIColor enloopGreen]];
counterView.layer.cornerRadius = 8;
self.counterLabel = [[UILabel alloc] init];
self.counterLabel.frame = CGRectMake(4, 2, 10, 10);
if (self.count >= 10) {
counterView.frame = CGRectMake(45, -2, 18, 18);
self.counterLabel.frame = CGRectMake(3, 3, 12, 12);
}
[self.counterLabel setTextColor:[UIColor whiteColor]];
[self.counterLabel setFont:[UIFont fontWithName: @"Trebuchet MS" size: 11.0f]];
[self.counterLabel setText:[[NSString alloc] initWithFormat:@"%lu", (unsigned long)self.count]];
[counterView addSubview:self.counterLabel];
[counterView bringSubviewToFront:self.counterLabel];
[self addSubview:counterView];
对于centerCropImage
helper,没有什么特别的:
+ (UIImage *)centerCropImage:(UIImage *)image {
// Use smallest side length as crop square length
CGFloat squareLength = MIN(image.size.width, image.size.height);
// Center the crop area
CGRect clippedRect = CGRectMake((image.size.width - squareLength) / 2, (image.size.height - squareLength) / 2, squareLength, squareLength);
CGImageRef imageRef = CGImageCreateWithImageInRect([image CGImage], clippedRect);
UIImage * croppedImage = [UIImage imageWithCGImage:imageRef];
CGImageRelease(imageRef);
return croppedImage;
}
我知道还有很多地方需要改进,但在此之前,我希望它能帮助其他人。:) 谢谢阿德拉的建议,绝对有帮助!