iOS开发之地图代理不起作用(提示vImage decode failed, falling back to CG path.)

项目中用到了地图相关的东西，就把以前的demo搬了出来，结果发现直接运行之前的demo没有问题，在xcode5下新建项目再把代码粘贴过来就会提示

May 5 11:36:21 infomedia-iPod-touch TestLocation[1465] <Error>: CGBitmapContextCreate: unsupported parameter combination: 5 integer bits/component; 16 bits/pixel; 3-component color space; kCGImageAlphaNoneSkipLast; 512 bytes/row.
May 5 11:36:21 infomedia-iPod-touch TestLocation[1465] <Error>: CGBitmapContextCreate: unsupported parameter combination: 5 integer bits/component; 16 bits/pixel; 3-component color space; kCGImageAlphaNoneSkipLast; 512 bytes/row.
2014-05-05 11:36:21.974 TestLocation[1465:8b03] vImage decode failed, falling back to CG path.
2014-05-05 11:36:21.969 TestLocation[1465:9003] vImage decode failed, falling back to CG path.
May 5 11:36:22 infomedia-iPod-touch TestLocation[1465] <Error>: CGBitmapContextCreate: unsupported parameter combination: 5 integer bits/component; 16 bits/pixel; 3-component color space; kCGImageAlphaNoneSkipLast; 512 bytes/row.
2014-05-05 11:36:22.653 TestLocation[1465:a003] vImage decode failed, falling back to CG path.
May 5 11:36:22 infomedia-iPod-touch TestLocation[1465] <Error>: CGBitmapContextCreate: unsupported parameter combination: 5 integer bits/component; 16 bits/pixel; 3-component color space; kCGImageAlphaNoneSkipLast; 512 bytes/row.
2014-05-05 11:36:22.691 TestLocation[1465:9503] vImage decode failed, falling back to CG path.
May 5 11:36:22 infomedia-iPod-touch TestLocation[1465] <Error>: CGBitmapContextCreate: unsupported parameter combination: 5 integer bits/component; 16 bits/pixel; 3-component color space; kCGImageAlphaNoneSkipLast; 512 bytes/row.
2014-05-05 11:36:22.711 TestLocation[1465:890b] vImage decode failed, falling back to CG path.
May 5 11:36:22 infomedia-iPod-touch TestLocation[1465] <Error>: CGBitmapContextCreate: unsupported parameter combination: 5 integer bits/component; 16 bits/pixel; 3-component color space; kCGImageAlphaNoneSkipLast; 512 bytes/row.
2014-05-05 11:36:22.725 TestLocation[1465:9003] vImage decode failed, falling back to CG path.
May 5 11:36:22 infomedia-iPod-touch TestLocation[1465] <Error>: CGBitmapContextCreate: unsupported parameter combination: 5 integer bits/component; 16 bits/pixel; 3-component color space; kCGImageAlphaNoneSkipLast; 512 bytes/row.
2014-05-05 11:36:22.733 TestLocation[1465:9b03] vImage decode failed, falling back to CG path.
May 5 11:36:22 infomedia-iPod-touch TestLocation[1465] <Error>: CGBitmapContextCreate: unsupported parameter combination: 5 integer bits/component; 16 bits/pixel; 3-component color space; kCGImageAlphaNoneSkipLast; 512 bytes/row.
2014-05-05 11:36:22.736 TestLocation[1465:8b03] vImage decode failed, falling back to CG path.
May 5 11:36:22 infomedia-iPod-touch TestLocation[1465] <Error>: CGBitmapContextCreate: unsupported parameter combination: 5 integer bits/component; 16 bits/pixel; 3-component color space; kCGImageAlphaNoneSkipLast; 512 bytes/row.
2014-05-05 11:36:22.777 TestLocation[1465:9207] vImage decode failed, falling back to CG path.

检查了很多遍，代码一模一样，就是代理方法不执行，到网上搜了好多资料，没有解决。最后想到在xcode5和xcode4.6下开发的差异，估计是arc捣的鬼，然后把arc改为NO，结果就正常运行了。顺便把代码贴出来……

工具：xcode5.0

1.新建一个single view application ，导入map kit和core location库，将arc改为NO

2.ViewController.h文件

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

@interface ViewController : UIViewController<CLLocationManagerDelegate> {
MKMapView *_mapView;
UILabel *_showLabel;
}

@end

ViewController.m文件
#import "ViewController.h"
#import "MapAddress.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad
{
[super viewDidLoad];

CLLocationManager* manager = [[CLLocationManager alloc] init];
//定位的精确度
manager.desiredAccuracy = kCLLocationAccuracyBest;
//定位距离
manager.distanceFilter = 1;
manager.delegate = self;
//开始定位
[manager startUpdatingLocation];

//地图
_mapView = [[MKMapView alloc] initWithFrame:CGRectMake(0, 0, 320, 460)];
_mapView.showsUserLocation = YES;
[self.view addSubview:_mapView];
}

//定位成功
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations{
//当前的位置
CLLocation* newLocation = [locations lastObject];
NSString* str = [MapAddress getGoogleAddress:newLocation];
NSLog(@"%@",str);

//停止定位
//[manager stopUpdatingLocation];

//地图显示
//定位后的经纬度
CLLocationCoordinate2D coordinate = newLocation.coordinate;
//缩放比例
MKCoordinateSpan span = MKCoordinateSpanMake(0.1, 0.1);
//确定要显示的区域
MKCoordinateRegion region = MKCoordinateRegionMake(coordinate, span);
//让地图显示这个区域
[_mapView setRegion:region animated:YES];
}

//定位失败
- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error{
NSLog(@"定位失败");
}
@end

3.MapAddress.h文件
#import <Foundation/Foundation.h>
#import <CoreLocation/CoreLocation.h>

@interface MapAddress : NSObject

+ (NSString *) getBaiduAddress:(CLLocation *)location;
+ (NSString *) getGoogleAddress:(CLLocation *)location;
@end

MapAddress.m文件
#import "MapAddress.h"

@implementation MapAddress

+ (NSString *) getBaiduAddress:(CLLocation *)location {
double latitude = location.coordinate.latitude;
double longtitude = location.coordinate.longitude;
NSString *urlstr = [NSString stringWithFormat:
@"http://api.map.baidu.com/geocoder?output=json&location=%f,%f&key=dc40f705157725fc98f1fee6a15b6e60",
latitude, longtitude];
NSURL *url = [NSURL URLWithString:urlstr];
NSString *s = [NSString stringWithContentsOfURL:url encoding:NSUTF8StringEncoding error:nil];
return s;
}
+ (NSString *) getGoogleAddress:(CLLocation *)location {
NSString *urlstr = [NSString stringWithFormat:
@"http://maps.google.com/maps/api/geocode/json?latlng=%f,%f&language=zh-CN&sensor=false",
location.coordinate.latitude, location.coordinate.longitude];
NSLog(@"%@", urlstr);
NSURL *url = [NSURL URLWithString:urlstr];
NSString *s = [NSString stringWithContentsOfURL:url encoding:NSUTF8StringEncoding error:nil];
return s;
}

@end