ios - 将 NSData 添加到 NSData 字节数组

Question

我想将图像添加到字节数组。下面的代码给我一个错误。我想我没有做对。

错误

Field has incomplete type 'NSData *__strong[]'

在.m文件中

@interface MyViewController() {

    NSData *byteArray[];

}

方法内部

NSData *imgD = UIImageJPEGRepresentation(img1, 0.1);

NSData *imgD2 = UIImageJPEGRepresentation(img2, 0.1);        

NSData *imgD3 = UIImageJPEGRepresentation(img13, 0.1);

 [byteArray addObject:imgD];

 [byteArray addObject:imgD2];

 [byteArray addObject:imgD3];

Answer 1

You can add an image to an array. Use NSMutableArray instead of NSData*[]. 

在.m文件中

@interface MyViewController() {    
    NSMutableArray *byteArray;    
}

方法内部

byteArray = [[NSMutableArray alloc] init];   
NSData *imgD = UIImageJPEGRepresentation(img1, 0.1);    
NSData *imgD2 = UIImageJPEGRepresentation(img2, 0.1);            
NSData *imgD3 = UIImageJPEGRepresentation(img13, 0.1);

[byteArray addObject:imgD]; 
[byteArray addObject:imgD2];
[byteArray addObject:imgD3];