訪問用特定格式存儲在asset catalog里面的一個對象，這是iOS9 SDK的新類，用于操作asset Category文件的。

- (instancetype)init NS_UNAVAILABLE;

/// Equivalent to -initWithName:name bundle:[NSBundle mainBundle];
- (nullable instancetype)initWithName:(NSString *)name;
/// Create a data asset with the given name from the given bundle. Returns nil if the asset was not found.
- (nullable instancetype)initWithName:(NSString *)name bundle:(NSBundle *)bundle NS_DESIGNATED_INITIALIZER;

/// The name used to reference the data asset
@property (nonatomic, readonly, copy) NSString *name;
/// The data for this asset, as stored in the asset catalog
@property (nonatomic, readonly, copy) NSData *data;
/// The Uniform Type Identifier for this data object.
@property (nonatomic, readonly, copy) NSString *typeIdentifier;

這里要特別注意一下，你在asset里建的文件一定是Data類型的，不然讀不出來

Data類型.png

Paste_Image.png

NSDataAsset *dataAsset=[[NSDataAsset alloc]initWithName:@"Data"];
    NSLog(@"%@---%@---%@",dataAsset.name,dataAsset.data,dataAsset.typeIdentifier);

控制臺打印：

控制臺.png