如何在地图视图上添加透明蒙版 [英] How to add a transparent mask on map View

问题描述

我想在我的MapView屏幕上添加一个颜色蒙版(没有坐标，我想在我的所有mapView上显示它)，并将控件保留在此mapView上.
我听说过MKOverlay，但是我不知道如何在所有地图上使用它，并且不使用坐标，因为我希望在所有地图屏幕上使用它.

I want to add a color mask on my MapView screen (without coordinate, I want to display it on all my mapView) and keep the control on this mapView.
I've heard about MKOverlay but I dont know how to use it for all the map and without using coordinate cause I want it on all the map screen.

有人有这个主意吗?

推荐答案

您可以通过实现-hitTest:withEvent:方法来创建过滤器视图.触摸过滤器视图时，它将在返回的视图上起作用:

You can create a filter view with implementing the -hitTest:withEvent: method. When you touch the filter view, it'll works on the view it returns:

返回包含指定点的视图层次结构中接收者的最远后裔(包括自身).

Returns the farthest descendant of the receiver in the view hierarchy (including itself) that contains a specified point.

假设您有一个名为mapView的MKMapView和一个名为mapFilterView的MapFilterView(从UIView继承)，它们都是mainView的子视图，但图层(mapFilterView在mapView上)除外.这是一个片段代码，将清楚地描述它:

Suppose you've a MKMapView called mapView, and a MapFilterView (subclassed from UIView) called mapFilterView, both of them are subviews of mainView, except the layer (mapFilterView is on mapView). Here's a snippet code that'll describe it clear:

MapFilterView.h

MapFilterView.h

...
@interface MapFilterView : UIView {
  MKMapView * mapView_;
}
@property (nonatomic, retain) MKMapView * mapView;
@end

MapFilterView.m

MapFilterView.m

#import "MapFilterView.h"

@implementation MapFilterView

@synthesize mapView = mapView_;

- (void)dealloc {
  self.mapView = nil;
  [super dealloc];
}

- (id)initWithFrame:(CGRect)frame {
  self = [super initWithFrame:frame];
  if (self) {
    // Initialization code
  }
  return self;
}

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
  UIView * child = [super hitTest:point withEvent:event];
  if (child == self)
    return mapView_;
  return child;
}

在主视图控制器中(假设在-viewDidLoad:中):

And in your main view controller (suppose in -viewDidLoad:):

// Create the map view
...
[self.view addSubview:self.mapView];

// Create the map filter view
mapFilterView_ = [[MapFilterView alloc] initWithFrame:mapFilterViewFrame];
mapFilterView_.mapView = self.mapView;
[self.view addSubview:mapFilterView_];

此代码仅是示例，您最好自己进行测试.希望这会有所帮助！ :)

This code is just a sample, you'd better test it yourself. Hope this'll helps! :)

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