对iphone应用程序加载图像的工具类 ImageHelper
#import
@interface ImageHelper : NSObject
@end
@interface ImageHelper (Files)
+ (UIImage *) imageNamed: (NSString *) aName;
+ (UIImage *) imageFromURLString: (NSString *) urlstring;
+ (NSArray *) DCIMImages;
+ (UIImage *) DCIMImageNamed: (NSString *) aName;
@end
#import "ImageHelper-Files.h"
@implementation ImageHelper
@end
NSString *documentsFolder()
{
return [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
}
NSString *bundleFolder()
{
return [[NSBundle mainBundle] bundlePath];
}
NSString *DCIMFolder()
{
return [NSHomeDirectory() stringByAppendingPathComponent:@"../../Media/DCIM"];
}
@implementation ImageHelper (Files)
+ (NSString *) pathForItemNamed: (NSString *) fname inFolder: (NSString *) path
{
NSString *file;
NSDirectoryEnumerator *dirEnum = [[NSFileManager defaultManager] enumeratorAtPath:path];
while (file = [dirEnum nextObject])
if ([[file lastPathComponent] isEqualToString:fname])
return [path stringByAppendingPathComponent:file];
return nil;
}
// Searches bundle first then documents folder
+ (UIImage *) imageNamed: (NSString *) aName
{
NSString *path = [ImageHelper pathForItemNamed:aName inFolder:bundleFolder()];
path = path ? path : [ImageHelper pathForItemNamed:aName inFolder:documentsFolder()];
if (!path) return nil;
return [UIImage imageWithContentsOfFile:path];
}
+ (UIImage *) imageFromURLString: (NSString *) urlstring
{
NSURL *url = [NSURL URLWithString:urlstring];
return [UIImage imageWithData:[NSData dataWithContentsOfURL:url]];
}
+ (NSArray *) DCIMImages
{
NSString *file;
NSMutableArray *results = [NSMutableArray array];
NSDirectoryEnumerator *dirEnum = [[NSFileManager defaultManager] enumeratorAtPath:DCIMFolder()];
while (file = [dirEnum nextObject]) if ([file hasSuffix:@"JPG"]) [results addObject:file];
return results;
}
+ (UIImage *) DCIMImageNamed: (NSString *) aName
{
NSString *path = [ImageHelper pathForItemNamed:aName inFolder:DCIMFolder()];
return [UIImage imageWithContentsOfFile:path];
}
@end