iOS把UIImage对象保存到本地沙盒

1. 保存

- (void)saveImage:(UIImage *)image {
    NSArray *paths =NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);
    
    
    NSString *filePath = [[paths objectAtIndex:0]stringByAppendingPathComponent:
                          [NSString stringWithFormat:@"demo.png"]];  // 保存文件的名称
    
    BOOL result =[UIImagePNGRepresentation(image)writeToFile:filePath   atomically:YES]; // 保存成功会返回YES
    if (result == YES) {
        NSLog(@"保存成功");
    }
    
}

2取出保存的图片

- (void)getImage {

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
    
    NSString *filePath = [[paths objectAtIndex:0]stringByAppendingPathComponent:
                          [NSString stringWithFormat:@"demo.png"]];
    // 保存文件的名称
    UIImage *img = [UIImage imageWithContentsOfFile:filePath];
    NSLog(@"=== %@", img);
    
}