我正在努力解决我的应用程序出了什么问题。我想保存并加载UIImages,简单吧?似乎不是这样。
我有一个使用这些方法的类来保存,加载和删除带有唯一字符串的图像。我喜欢它,简单明了。这是班级:
imageSavedLoad.h:
#import <Foundation/Foundation.h>
@interface imageSaveLoad : NSObject
- (void)saveImage:(UIImage*)image forKey:(NSString*)imageName;
- (void)removeImage:(NSString*)fileName;
- (UIImage*)loadImage:(NSString*)imageName;
@end
imageSaveLoad.m:
#import "imageSaveLoad.h"
@implementation imageSaveLoad
//saving an image
- (void)saveImage:(UIImage*)image forKey:(NSString*)imageName
{
NSData *imageData = UIImagePNGRepresentation(image);
NSFileManager *fileManager = [NSFileManager defaultManager];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *fullPath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.png", imageName]];
[fileManager createFileAtPath:fullPath contents:imageData attributes:nil];
NSLog(@"image saved");
}
//removing an image
- (void)removeImage:(NSString*)fileName
{
NSFileManager *fileManager = [NSFileManager defaultManager];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *fullPath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.png", fileName]];
[fileManager removeItemAtPath: fullPath error:NULL];
NSLog(@"image removed");
}
//loading an image
- (UIImage*)loadImage:(NSString*)imageName
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *fullPath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.png", imageName]];
return [UIImage imageWithContentsOfFile:fullPath];
}
@end
在我要保存,加载或删除图片的位置,我导入了这个类:#import "imageSaveLoad.h"
然后我创建它的一个实例并调用所需的方法(这里我保存):
imageSaveLoad *imgSL = [[imageSaveLoad alloc] init];
[imgSL saveImage:photoImgView.image forKey:@"yourPhoto"];
然后在我想要检索图像的另一个视图/类中:
imageSaveLoad *imgSL = [[imageSaveLoad alloc] init];
yourImgView.image = [imgSL loadImage:@"yourPhoto"];
但yourImgView
没有显示任何内容,空白。
那我哪里错了?我检查了所有IBOutlet
个连接,并且正在调用所有代码。我正在使用的方法有问题吗?
任何帮助都非常感激,它让我不知所措。
答案 0 :(得分:1)
保存图片时,请尝试替换此行:
[fileManager createFileAtPath:fullPath contents:imageData attributes:nil];
使用
[imageData writeToFile:fullpath atomically:YES];