NSArray的类方法创建

+ (instancetype)array;


+ (instancetype)arrayWithObject:(id)anObject;

+ (instancetype)arrayWithObjects:(id)firstObj, ...;

+ (instancetype)arrayWithArray:(NSArray *)array;


+ (id)arrayWithContentsOfFile:(NSString *)path; // 读取一个xml文件.

+ (id)arrayWithContentsOfURL:(NSURL *)url; // 读取一个xml文件.

NSArray的类方法创建

+ (instancetype)array;


+ (instancetype)arrayWithObject:(id)anObject;

+ (instancetype)arrayWithObjects:(id)firstObj, ...;

+ (instancetype)arrayWithArray:(NSArray *)array;


+ (id)arrayWithContentsOfFile:(NSString *)path; // 读取一个xml文件.

+ (id)arrayWithContentsOfURL:(NSURL *)url; // 读取一个xml文件.