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，就把曾经的demo搬了出来，结果发现直接执行之前的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.

检查了非常多遍，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，预计是arc捣的鬼，然后把arc改为NO，结果就正常执行了。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];
    //定位的准确度
    manager.desiredAccuracy = kCLLocationAccuracyBest;
    //定位距离
    manager.distanceFilter = 1;
    manager.delegate = self;
    //開始定位
    [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