iPhone、iPad开发之图片资源管理

     <p>        移动开发设计的设备、屏幕很多（如cocoa开发分为iPhone版、iPad版， 它们又分为横屏、竖屏），所以图片资源的统一管理是必要的。下面是自己想的一个解决方案，欢迎交流。</p>    <p>       文件GGImageNameKey.h、GGImageNameKey.m用于管理图片的名字。由一个键值，根据是iPhone、iPad、横屏、竖屏等关联出一个图片的名字，从而实现图片名字资源的统一管理。</p>    <p>     文件GGImageManageService.h、GGImageManageService.m用于管理图片资源，现在只有加载图片资源的功能。</p>    <p></p>    <pre class="brush:cpp; toolbar: true; auto-links: false;">      // 文件GGImageNameKey.h begin               #import <Foundation/Foundation.h>              @interface UZImageNameKey : NSObject {               }              + (NSDictionary *)imageNameDatas;             @end            // 这里定义图片资源的键值，有键值会关联出一个图片名             #define GGNextStepImage                 @"GGNextStepImage"                     ...........                                                  .............             // 文件GGImageNameKey.h end        // 文件GGImageNameKey. begin               #import "GGImageNameKey.h"              @implementation GGImageNameKey                   + (NSDictionary *)imageNameDatas {                   /* 因为这个对象创建后放在自动释放池里，在下一次runLoop中会被销毁。                   所以建议在程序运行中，该方法只调用一次，而且获取资源后，需要retain一份 */                   NSDictionary *dict = nil;                     dict = [NSDictionary dictionaryWithObjectsAndKeys:                             // 以此为iPhone横屏、iPhone竖屏、iPad横屏、iPad竖屏对应的图片名字                             [NSArray arrayWithObjects:@"GGNextStepIphoneL.png",@"GGNextStepIphoneP.png", @"GGNextStepIpadL.png",@"GGNextStepIpadP.png", nil],                              GGNextStepImage,                             ... ...                          nil];                                     return dict;              }            @end        // GGImageNameKey.m end          // GGImageManageService.h begin                #import <Foundation/Foundation.h>                #import "GGImageNameKey.h"                // 获取图片名字               #define GGImageNameForKey(key)    [GGImageManageService imageNameForKey:key]               // 加载图片               #define GGImageCacheForKey(key)   [GGImageManageService imageCacheForKey:key]               #define GGImageForKey(key)             [GGImageManageService imageForKey:key]               @interface GGImageManageService : NSObject {                         NSDictionary *_datas;     // 图片资源数据                         NSInteger _index;           // 需要获取的图片类型的索引                 }                  // 由键值获取一张图片名                 + (NSString *)imageNameForKey:(NSString *)key;                 // 加载一张图片 注意：这种图片加载方式，图片是加载到iPhone系统缓存                 + (UIImage *)imageCacheForKey:(NSString *)key;                 // 加载一张图片                 + (UIImage *)imageForKey:(NSString *)key;                 // 关闭服务                 + (void)shutdownService;                 @property (nonatomic,retain) NSDictionary *datas;                 @property (nonatomic) NSInteger index;                 @end            // GGImageManageService.m end                        // GGImageManageService.m begin                      #import "GGImageManageService.h"                      #import "GGImageNameKey.h"                      static GGImageManageService *sGGImageManageService =nil;                      @implementation UZImageManageService                      @synthesize datas = _datas;                      @synthesize index = _index;                      - (id)init {                                 if (self = [super init]) {                                          _datas = [GGImageNameKey imageNameDatas];                                          [_datasretain];                                          NSInteger orientation = [[UIApplication sharedApplication] statusBarOrientation];  // 获取屏幕方向                                          if (orientation ==UIInterfaceOrientationLandscapeLeft || orientation == UIInterfaceOrientationLandscapeRight) {                                                    _index =0;                                          }                                         else {                                                    _index =1;                                          }                                          if (0/**设备为iPad */) {                                                    _index = _index +2;                                          }                                }                                return self;                      }                      + (void)shutdownService {                                SAFE_RELEASE(sGGImageManageService);                      }                       + (void)createSelf {                                if (sGGImageManageService ==nil) {                                          sGGImageManageService = [[GGImageManageService alloc] init];                                                  }                      }                      + (NSString *)imageNameForKey:(NSString *)key {                                [GGImageMangeService createSelf];                                return [[sGGImageManageService.datasobjectForKey:key] objectAtIndex:GGImageMangeService.index];                      }                      + (UIImage *)imageForKey:(NSString *)key {                                NSString *path = [[NSBundle mainBundle] pathForResource:[GGImageMangeService imageNameForKey:key] ofType:nil];                                return [UIImage imageWithContentsOfFile:path];                      }                      + (UIImage *)imageCacheForKey:(NSString *)key {                                return [UIImage imageNamed:[GGImageMangeService imageNameForKey:key]];                      }                      - (void)dealloc {                                SAFE_RELEASE(_datas);                                [super dealloc];                     }                    @end            // GGImageMangeService       end</pre>    <p class="p7"></p>    <p class="p7">          说明：应用程序退出时，需要调用[GGImageMangeService  shutdownService];</p>