MKMapKit 和 IOS4

Question

嘿大家， 我正在尝试让 MKMapView 启动并运行，但是我似乎无法克服似乎是参考错误的问题。我花了几个小时在谷歌上搜索这个以及昨晚。

标题：

#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>

@interface MapsViewController : UIViewController {
    MKMapView *mapView;
}

@end

主要：

#import "MapsViewController.h"

@implementation MapsViewController
- (void)viewDidLoad {
    [super viewDidLoad];
    mapView = [[MKMapView alloc] initWithFrame:self.view.frame];
    [self.view insertSubview:mapView atIndex:0];
}

- (void)didReceiveMemoryWarning {
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];

    // Release any cached data, images, etc that aren't in use.
}

- (void)viewDidUnload {
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}
- (void)dealloc {
    [super dealloc];
    [mapView dealloc];
}

@end

错误：

Build Maps of project Maps with configuration Debug

Ld build/Debug-iphonesimulator/Maps.app/Maps normal i386
cd /workspace/iphone_dev/Maps
setenv MACOSX_DEPLOYMENT_TARGET 10.6
setenv PATH "/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc-4.2 -arch i386 -isysroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.1.sdk -L/workspace/iphone_dev/Maps/build/Debug-iphonesimulator -F/workspace/iphone_dev/Maps/build/Debug-iphonesimulator -filelist /workspace/iphone_dev/Maps/build/Maps.build/Debug-iphonesimulator/Maps.build/Objects-normal/i386/Maps.LinkFileList -mmacosx-version-min=10.6 -Xlinker -objc_abi_version -Xlinker 2 -framework Foundation -framework UIKit -framework CoreGraphics -o /workspace/iphone_dev/Maps/build/Debug-iphonesimulator/Maps.app/Maps

Undefined symbols:
  "_OBJC_CLASS_$_MKMapView", referenced from:
      objc-class-ref-to-MKMapView in MapsViewController.o
ld: symbol(s) not found
collect2: ld returned 1 exit status

我设法在适当的文件夹中找到 MKMapKit.framework。他们是我缺少的东西吗？

Answer 1

听起来您需要通过右键单击 Xcode 中的项目列表并选择“添加”->“现有框架”来将 MapKit.framework 添加到您的项目中。选择 MapKit，您应该会看到它列在 Targets -> 下您的应用程序 ->将二进制文件与库链接。

Answer 2

博斯马克说的是正确的。另请注意，您的 dealloc 方法不正确。

- (void)dealloc {
  [mapView release];
  [super dealloc];
}

除了 super 和 [super dealloc] 之外，你不应该对任何东西调用 dealloc；总是出现在 dealloc 方法的末尾。