控制的MKMapView在iOS6的动画速度 [英] Controlling the animation speed of MKMapView in iOS6

问题描述

我试图按照汽车在地图视图。

I'm trying to follow a car on a map view.

这code应该动画车以相同的速度地图，从而使注解视图始终出现在中心：

This code should animate the car and the map with the same speed, so that the annotation view always appears in the center:

[UIView beginAnimations:nil context:NULL];
[UIView setAnimationCurve:UIViewAnimationCurveLinear];
[UIView setAnimationDuration: 1.0];
[UIView setAnimationBeginsFromCurrentState:YES];

[car setCoordinate:coord];
[mapView setCenterCoordinate:coord];

[UIView commitAnimations];

它在iOS的5好工作在iOS 6中地图上没有动画了，但车上没有动画。

我试过 [图形页面setCenterCoordinate：共同动画：是] ，但我无法控制动画的速度。它总是以默认的持续时间（0.2秒）动画。

I tried [mapView setCenterCoordinate:co animated:YES], but then I cannot control the animation speed. It will always animate with the default duration (0.2s).

推荐答案

这似乎是不可能使用的MKMapView 这些方法时，控制动画速度的iOS 6

It seems it is not possible to control the animation speed in iOS 6 when using these methods in MKMapView:

- (void)setRegion:(MKCoordinateRegion)region animated:(BOOL)animated;
- (void)setCenterCoordinate:(CLLocationCoordinate2D)coordinate animated:(BOOL)animated;
- (void)setVisibleMapRect:(MKMapRect)mapRect animated:(BOOL)animate;
- (void)setVisibleMapRect:(MKMapRect)mapRect edgePadding:(UIEdgeInsets)insets animated:(BOOL)animate;

不过，我发现，有一个持续时间参数的私有方法。所以，我解决我的问题，通过继承的MKMapView并重写私有方法（一种只能在iOS6的存在）：

However I found a private method that has a duration parameter. So I solved my issue by subclassing MKMapView and overriding the private method (which only exists in iOS6):

MyMapView.h

#import <MapKit/MapKit.h>

@interface MyMapView : MKMapView

@property(nonatomic) BOOL overridesAnimationDuration;
@property(nonatomic) NSTimeInterval mapAnimationDuration;

@end

MyMapView.m

@interface MKMapView (Private)
- (void)_setZoomScale:(float)scale centerMapPoint:(CLLocationCoordinate2D)center duration:(double)d animationType:(int)animType;
@end

@implementation MyMapView
- (void)_setZoomScale:(float)scale centerMapPoint:(CLLocationCoordinate2D)center duration:(double)d animationType:(int)animType
{
    if (_overridesAnimationDuration) {
        d = _mapAnimationDuration;
    }
    [super _setZoomScale:scale centerMapPoint:center duration:d animationType:animType];
}    
@end

我添加了2个属性，使您可以覆盖默认的动画时间。
要使用它的区域变化，设置 mapAnimationDuration 来所需的持续时间之前设置 overridesAnimationDuration 来YES，然后切换 overridesAnimationDuration 来NO在委托调用图形页面：regionWillChangeAnimated：

I've added 2 properties that allow you to override the default animation time. To use it set overridesAnimationDuration to YES before a region change, set mapAnimationDuration to the desired duration and switch overridesAnimationDuration to NO in the delegate call mapView:regionWillChangeAnimated:.

请注意，这可能不会在将来的IOS版本工作，因为它是私有的API。苹果可以删除或更改此方法。

Note, this might not work in future iOS versions because it is private API. Apple can remove or change this method.

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