Objective-C在app中保存和加载图像

UIImage *image = [UIImage imageNamed:@"example.png"];
NSData *imageData = UIImagePNGRepresentation(image);

NSString *filePath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject];
filePath = [filePath stringByAppendingPathComponent:@"savedImage.png"];

BOOL success = [imageData writeToFile:filePath atomically:YES];
if (success) {
    NSLog(@"图像保存成功");
} else {
    NSLog(@"图像保存失败");
}

NSString *filePath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject];
filePath = [filePath stringByAppendingPathComponent:@"savedImage.png"];

if ([[NSFileManager defaultManager] fileExistsAtPath:filePath]) {
    UIImage *loadedImage = [[UIImage alloc] initWithContentsOfFile:filePath];
    // 使用加载的图像进行后续操作
} else {
    // 处理文件不存在的情况
    // 可以使用默认的占位图像或其他逻辑
}