OBJECTIVE-C Series-nsmutablearray

objective-c series-NSMutableArray
********************************************
// Variable array constructor
    // The definitions of the following two sentences are immutable
// NSMutableArray * marray1 = [[NSArray alloc] init];
// NSMutableArray * marray1 = @ [@ "xx", @ "yy"];
    
    // The default array has no elements
    NSMutableArray * marray1 = [[NSMutableArray alloc] init];
    NSMutableArray * marray = [NSMutableArray array];
    NSMutableArray * marray2 = [[NSMutableArray alloc] initWithArray: @ [@ "1", @ "2"]];
    NSMutableArray * marray3 = [[NSMutableArray alloc] initWithObjects: @ "one", @ "two", @ "three", nil];
    
    id objs [5] = {@ "123", @ "456", @ "789", @ "abc", @ "def"};
    // The type of objs is: id [5];
    // Because objs is the name of the array, that is, the address of the first element, and because the type of the first element is id;
    // So: the type of objs is: id *
    
    NSMutableArray * marray4 = [[NSMutableArray alloc] initWithObjects: objs count: 3];
    NSLog (@ "marray4:% @", marray4);
    
    // open 80 bytes of dynamic memory for memory,
    // That memory points to 80 bytes of legal memory
    id * memory = (__bridge id *) malloc (80);
    memory [0] = @ "mem1";
    memory [1] = @ "mem2";
    memory [2] = @ "mem3";
    memory [3] = @ "mem4";
    memory [4] = @ "mem5";
    NSMutableArray * marray5 = [[NSMutableArray alloc] initWithObjects: memory count: 3];
    NSLog (@ "marray5:% @", marray5);
 
    // Construct a variable array, initially give it 10 elements of space, but no elements
    NSMutableArray * marray6 = [[NSMutableArray alloc] initWithCapacity: 10];
    // Note: marray6 is still an empty array, that is, no elements exist
    NSLog (@ "marray6:% @", marray6);
********************************************
// Add elements to the array
    // add insert
    NSMutableArray * array = [[NSMutableArray alloc] init];
    // Append an element to the tail
    [array addObject: @ "theFirstObject"];
    NSLog (@ "First call addObject: array:% @", array);
    
    [array addObject: @ "theSecondObject"];
    NSLog (@ "second call addObject: array:% @", array);
 
    // Splice an array at the end
    [array addObjectsFromArray: @ [@ "add1", @ "add2"]];
    NSLog (@ "First call addObjectsFromArray: array:% @", array);
    
    // Result description addObject is to add elements to the end of the array
    [array insertObject: @ "theInsertObject" atIndex: 1];
    NSLog (@ "First call insertObject: array:% @", array);
********************************************
// Delete elements from the array
    NSMutableArray * array = [[NSMutableArray alloc] initWithArray: @ [@ "1", @ "2", @ "3", @ "4", @ "5", @ "6", @ "1", @ " 1" ]];
    NSLog (@ "array:% @", array);
    // remove
    // Delete all occurrences of this object in the array
    [array removeObject: @ "1"];
    NSLog (@ "First call removeObject: array:% @", array);
 
    // delete the last element
    [array removeLastObject];
    // Delete the element under the scale
    [array removeObjectAtIndex: 0];
    // delete all elements
    [array removeAllObjects];
********************************************
// Reset the array and replace the element of a certain index
    NSMutableArray * array = [[NSMutableArray alloc] initWithArray: @ [@ "abc", @ "def", @ "ghi"]];
    
    NSLog (@ "raw array: array:% @", array);
    NSArray * newArray = @ [@ "123", @ "456", @ "789"];
    [array replaceObjectsInRange: NSMakeRange (0, [array count]) withObjectsFromArray: newArray];
    NSLog (@ "Array with all elements replaced: array:% @", array);
    
    [array replaceObjectAtIndex: 1 withObject: @ "[theFisrtReplaceObject]"];
    NSLog (@ "replace a subscript element: array:% @", array);
    NSLog (@ "The newly replaced element is:% @", [array objectAtIndex: 1]);
********************************************
// Other common methods of array objects
    NSArray * array = @ [@ "one", @ "two", @ "three"];
    // Get the first element of the array
    id obj1 = [array firstObject];
    NSLog (@ "obj1:% @", obj1);
    // Get the tail element of the array
    id obj2 = [array lastObject];
    NSLog (@ "obj2:% @", obj2);
********************************************
********************************************