Objective C类中的调用方法

Question

Coming from the Java world to the iPhone, I would like to see the following Java expressed in Objective C. For clarity's sake, I've kept the Obj-C class types.

NSString myData = "some stuff";
NSMutableArray myArray = parseDataIntoAnArray(myData);
...
private NSMutableArray parseDataIntoAnArray(NSString aString){
  NSMutableArray myArray = new NSMutableArray();
  // objects added here to myArray by manipulating aString
  return myArray;
}

Thanks, Steve

Answer 1

// All string literals require the "@" symbol at the beginning.
NSString *myData = @"some stuff";
NSMutableArray *myArray = [self parseDataIntoAnArray:myData];

-(NSMutableArray*)parseDataIntoAnArray:(NSString*)aString {
  NSMutableArray *myArray = [NSMutableArray array];

  return myArray;
}

Of course you would probably want to expose the method in the header file by including the method signature:

-(NSMutableArray*)parseDataIntoAnArray:(NSString*)aString;

Answer 2

NSString * myData = @"some stuff";
// assumption is that parseDataInto... is a static method on your Foo class
NSMutableArray * myArray = [Foo parseDataIntoAnArray: myData];

+ (NSMutableArray *) parseDataIntoAnArray: (NSString*) aString
{
   NSMutableArray *myArray = [NSMutableArray array]
   // stuff here
   return myArray;
}

Note that your method (as you defined it) returns NSString* , and is assigning it to a NSMutableArray* , which are incompatible pointer types. My example above, switches the return type to NSMutableArray* which is what I think you mean to do.

Answer 3

I think you should first forget Java or any other programming languages. Then you could read the documentation about Objective-C and the basic classes like NSString or others. Just take a look at the actually working code, hope to help:

NSString *myData = @"some stuff";//string initializer
NSMutableArray *myArray = [self parseDataIntoAnArray:myData];//Object-C's message(just like methods or something)

//instance method, take a parameter named aString
- (NSMutableArray *)parseDataIntoAnArray:(NSString *)aString{
  NSMutableArray *myArray = [NSMutableArray array];//array initializer

  [myArray addObject:aString];//another Message, add object to the array

  return myArray;//return the passed array, that's done.
}