MapView 拖放引脚 - 自定义 MKAnnotationView iOS 5

Question

我花了好几个小时寻找并更新一些可以在 iOS 5 上使用的拖拽图钉的东西。我想我已经很接近了......但是在尝试初始化自定义注释时却很困难。

这是我的类

.h
@interface AnnotationView : MKAnnotationView ...

.m
@interface AnnotationView () 
@property (nonatomic, assign) BOOL hasBuiltInDraggingSupport;
@end

@implementation AnnotationView
@synthesize hasBuiltInDraggingSupport, mapView;


- (id)initWithAnnotation:(id <MKAnnotation>)annotation reuseIdentifier:(NSString *)reuseIdentifier {

self.hasBuiltInDraggingSupport = [[MKAnnotationView class] instancesRespondToSelector:NSSelectorFromString(@"isDraggable")];

if (self.hasBuiltInDraggingSupport) {
    if ((self = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:reuseIdentifier])) {
        [self performSelector:NSSelectorFromString(@"setDraggable:") withObject:[NSNumber numberWithBool:YES]];
    }
}

self.canShowCallout = YES;
return self;
}
@end

，问题出在

self = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:reuseIdentifier]

它所说的行上： Incompromedpointers types allocateing to 'AnnotationView * __strong' from 'MKPinAnnotationView *'

另外，下一行收到警告

[self performSelector:NSSelectorFromString(@"setDraggable:") withObject:[NSNumber numberWithBool:YES]];

Thx

警告说 setDraggable: 选择器未知..但不应该继承

Answer 1

- (MKAnnotationView *)mapView:(MKMapView *)theMapView viewForAnnotation:(id<MKAnnotation>)annotation
{
    MKPinAnnotationView* annView = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:@"xxx"];
    // check conditions for class of annview or other    
    annView.draggable = YES;
}