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我正在为我的应用程序出了什么问题而头疼。我正在尝试保存和加载 UIImages，简单吧？似乎不是这样。

我有一个带有这些方法的类来保存、加载和删除具有唯一字符串的图像。就像我喜欢的那样，又好又简单。这是课程：

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

图像保存加载.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、加载或删除图像的地方导入类：#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什么都不显示，空白。

那么我哪里错了？我检查了所有IBOutlet连接并且所有代码都被调用了。我使用的方法有问题吗？

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1 回答 1

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保存图像时，请尝试替换此行：

 [fileManager createFileAtPath:fullPath contents:imageData attributes:nil];

和

 [imageData writeToFile:fullpath atomically:YES];
于 2012-07-24T19:08:32.583 回答