pressing按钮后，更改PIN的颜色在地图上的另一个屏幕上

问题描述：

我需要找到一种方法来改变时，地图是通过从其他画面按下一个按钮加载的脚色。

I need to find a way to change the pin color when the map is loaded by pushing a button from another screen.

例如，原来的引脚都红了，但是当我去到一个页面并推动地图按钮，它必须使我的地图视图和所在位置的坐标必须标有绿色引脚。

For example, the original pins are all red, but when I go to a page and push the map button, it has to lead me to the map view and the coordinates of that location have to be marked with a green pin.

我已经在地图设置，使引脚的设置都红了。

I already have the map set up and the setup of making the pins all red.

任何帮助是AP preciated。

Any help is appreciated.

所以，只要回顾一下：
网页地图用红别针 - >点击针，单击批注（另一种视图中打开） - >里面查看，有一个按钮，点击按钮（如@更改PIN色。） - >地图绿色页脚打开。（看看上面有图片的例子。）

So, just a recap: Page with map with red pin --> click pin, click annotation (another view opens) --> inside view, there is a button (eg. @"change pin color"), click button --> page with map with green pin opens. (Look at the example above with pictures.)

答

为什么你不只是声明了一个新的构造函数来设置你所选择的颜色？

Why don't you just declare a new constructor to set the colour of your choice?

// ViewControllerB .h file
@interface ViewControllerB
{
    UIColor *pinColor;
}

-(id)initWithPinColor:(UIColor *)chosenPinColor;

...

// ViewControllerB .m file
-(id)initWithPinColor:(UIColor *)chosenPinColor
{
    self = [super init];

    if(self)
    {
        pinColor = chosenPinColor;
    }

    return self;
}

...

-(MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation
{
    if([annotation isKindOfClass:[MKUserLocation class]])
    {
        return nil;
    }

    static NSString *annotationViewID = @"annotationViewID";

    MKPinAnnotationView *annotationView = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:annotationViewID];

    if(!annotationView)
    {
        annotationView = [[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:annotationViewID] autorelease];
    }

    // this will use the pinColor stored in the constructor
    annotationView.pinColor = pinColor;        
    annotationView.canShowCallout = YES;
    annotationView.animatesDrop = YES;

    annotationView.annotation = annotation;

    return annotationView;
}

然后，你可以简单地做这ViewControllerA：

Then you can simply do this in ViewControllerA:

// ViewControllerA .m file
#import "ViewControllerB.h"

...

-(void)showMapWithPinColor:(id)sender
{
    ViewControllerB *vc = [[ViewControllerB alloc] initWithPinColor:[UIColor green]];

    [self.navigationController pushViewController:vc animated:YES];
}

pressing按钮后，更改PIN的颜色在地图上的另一个屏幕上

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