我需要在我的MkMapView上顯示約10個位置和相應的自定義註釋圖像(取決於由JSON解析加載的值)。正如previous answers中所建議的,我創建了一個自定義註記類來存儲一些數據,但是我再次無法獲得正確的順序:每個地圖位置上的自定義圖像並不尊重各自分析值的正確順序,而在UITableView中全部完美。這是簡化的代碼:MKViewAnnotation自定義註釋在MKMapView中添加時丟失順序
對應的例子:
if parsed valuesID is 100 ---> annotation image must be 100.png
if parsed valuesID is 200 ---> annotation image must be 200.png
if parsed valuesID is 300 ---> annotation image must be 300.png
viewDidLoad方法:
- (void)viewDidLoad
{
[super viewDidLoad];
map.showsUserLocation = true;
map.mapType = MKMapTypeStandard;
#define MakeLocation(lat,lon) [[CLLocation alloc] initWithLatitude:lat longitude:lon]
locations= @[ MakeLocation(lat1,lon1), MakeLocation(lat2,lon2), MakeLocation(lat3,lon3), MakeLocation(lat4,lon4), MakeLocation(lat5,lon5), MakeLocation(lat6,lon6), MakeLocation(lat7,lon7), MakeLocation(lat8,lon8), MakeLocation(lat9,lon9), MakeLocation(lat10,lon10) ];
}
由一個UIButton調用的parseMethod:
- (IBAction)parseMethod {
[map removeAnnotations:map.annotations];
// THE COMPLEX CODE TO PARSE VALUES of valuesID
...
... // so here I have the full array of valuesID
...
// THE CONTROL FOR THE END OF COMPLETE PARSING (blocks, cycle, ...)
[self addAnnotations]; // here i'm sure to call method AFTER THE END of complete parsing
}
的MyAnnotation2.h自定義類:
#import <Foundation/Foundation.h>
#import <MapKit/MapKit.h>
@interface MyAnnotation2 : NSObject <MKAnnotation>
@property (nonatomic, assign) CLLocationCoordinate2D coordinate;
@property (nonatomic, assign) int valuesIDMyAnnotation2;
@end
的MyAnnotation2.m自定義類:
#import "MyAnnotation2.h"
@implementation MyAnnotation2
@synthesize coordinate;
@synthesize valuesIDMyAnnotation2;
@end
的addAnnotations方法(稱爲解析的COMPLETE結束後):
- (void)addAnnotations {
[table reloadData]; // UITableView with rows populated with locations coordinates and respective valuesID
[table scrollRectToVisible:CGRectMake(0, 0, 1, 1) animated:YES];
for (int l=0; l<[locations count]; l++) {
annotation2 = [[MyAnnotation2 alloc] init]; // create MyAnnotation2 istance to assign custom properties
annotation2.valuesIDMyAnnotation2 = [[valuesID objectAtIndex:l] intValue];
annotation2.coordinate = [locations[l] coordinate];
[map addAnnotation: annotation2]; // here we call delegate with all necessary data to add annotations, both location coordinate and corresponding valuesID
NSLog(@"%d - COORDINATES: %f - %f",annotation2.valuesIDMyAnnotation2,annotation2.coordinate.latitude, annotation2.coordinate.longitude);
}
}
的UITableView的委託:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell"];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:
UITableViewCellStyleSubtitle reuseIdentifier:@"Cell"];
}
cell.textLabel.text = [NSString stringWithFormat:@"%@",[coordinates objectAtIndex:indexPath.row]]; // here coordinates are values from each location
if ([[valuesID objectAtIndex:indexPath.row] intValue] == 100) {
UIImage *image = [UIImage imageNamed:@"100.png"];
[cell.imageView setImage:image];
}
if ([[valuesID objectAtIndex:indexPath.row] intValue] == 200) {
UIImage *image = [UIImage imageNamed:@"200.png"];
[cell.imageView setImage:image];
}
if ([[valuesID objectAtIndex:indexPath.row] intValue] == 300) {
UIImage *image = [UIImage imageNamed:@"300.png"];
[cell.imageView setImage:image];
}
return cell
}
最後,viewForAnnotation委託:
- (MKAnnotationView *) mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>) annotation {
if (! [annotation isKindOfClass:[MyAnnotation2 class]])
{
((MKUserLocation *)annotation).title = @"My position";
return nil;
}
MKAnnotationView *pinView= [[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"pinView"];
MyAnnotation2 *myPin = (MyAnnotation2 *)annotation;
if (myPin.valuesIDMyAnnotation2 == 100) {
pinView.image = [UIImage imageNamed:@"100.png"];
}
if (myPin.valuesIDMyAnnotation2 == 200) {
pinView.image = [UIImage imageNamed:@"200.png"];
}
if (myPin.valuesIDMyAnnotation2 == 300) {
pinView.image = [UIImage imageNamed:@"300.png"];
}
[pinView setFrame:CGRectMake(0, 0, 25, 25)];
return pinView;
}
編輯 - 例如NSLogs結果(代碼從addAnnotations法):
100 - COORDINATES lat1 - lon1 // here I expect annotation images100.png on location1
200 - COORDINATES lat2 - lon2 // ...
100 - COORDINATES lat3 - lon3
300 - COORDINATES lat4 - lon4
100 - COORDINATES lat5 - lon5
200 - COORDINATES lat6 - lon6
100 - COORDINATES lat7 - lon7
300 - COORDINATES lat8 - lon8
300 - COORDINATES lat9 - lon1
200 - COORDINATES lat10 - lon10
結果: 在UITableView上它的所有完成,我可以看到位置座標和自定義圖像之間的正確對應關係,並且NSLog()也給出了位置和值ID的正確對應關係。在MKMapView上,相反,自定義註釋圖像沒有添加在正確的序列,所以我有正確的註釋圖像,但在錯誤的位置。請幫助我再次解決此問題,謝謝!
在viewForAnnotation中,爲所有三個if分配了相同的圖像。這是故意的嗎? – Anna 2013-02-08 13:14:59
是@AnnaKarenina,它一直是我的轉錄錯誤:現在我已經糾正它,並且還添加了UITableView委託,以提供更精確和清晰的代碼。謝謝! – Huxley 2013-02-08 13:27:10
另一個拼寫錯誤:'annotation2.valueIDMyAnnotation2 ='應該是'annotation2.valuesIDMyAnnotation2 ='(在'ID'前面缺少's') - 如果您複製+粘貼確切的代碼而不是重新輸入會更好。無論如何,在發佈的代碼中沒有明顯的問題。唯一的可能性是'coordinates'數組(使用表視圖)與'locations'數組(註釋正在使用)不匹配。 – Anna 2013-02-08 14:09:31