CLLocation iVar释放值，在程序中途变为null
|
这是我的第一篇文章，但我一直都在阅读该网站。我正在研究一个在多个类之间传递CLLocation *的程序。首先，我的应用程序代理使用CLLocationManager查找当前位置。找到位置后，didUpdateToLocation：newLocation：fromLocation方法将此位置设置为另一个名为queryPage的类：
//AppDelegate.m
-(void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *) newLocation fromLocation:(CLLocation *)oldlocation {
currentLocation = newLocation;
[queryPage setLocation:currentLocation];
}
//QueryPage.h
#import <CoreLocation/CoreLocation.h>
#import <MapKit/MapKit.h>
@interface QueryPage : UIViewController {
CLLocation *currentLocation;
}
@property (nonatomic, retain) CLLocation *currentLocation;
-(void)setLocation:(CLLocation*)location;
//QueryPage.m
#import QueryPage.h
@implementation QueryPage
@synthesize currentLocation;
...
-(void)setLocation:(CLLocation*)location
{
self.currentLocation = location;
}
...
-(IBAction)button1:(id)sender
{
NSLog(@\"button1: %@\", currentLocation);
}
...
-(IBAction)button2:(id)sender
{
NSLog(@\"button2: %@\", currentLocation);
}
没有找到相关结果
已邀请:
1 个回复
艾食魄轻县