IOS 开发之 NSMutableArray与NSArray 的区别

NSArray and its subclass NSMutableArray manage collections of objects called arrays. NSArray creates static arrays, and NSMutableArray creates dynamic arrays.

- (void)addObject:(id)anObject

Inherits from NSValue : NSObject

NSUInteger count = 1;NSNumber *j = [NSNumber numberWithInt:count];[ary addObject:j];

#pragma mark -#pragma mark (NSMutableArray *)randArray:(NSMutableArray *)ary- (NSMutableArray *)randArray:(NSMutableArray *)ary{  NSMutableArray *tmpAry = [NSMutableArray arrayWithArray:ary];  NSUInteger count = [ary count];  for(NSUInteger i = 0; i < count; ++i) {    intnElements = count - i;    // Seed the random number generator    srandom(time(NULL));    intn = (random() % nElements) + i;    [tmpAry exchangeObjectAtIndex:i withObjectAtIndex:n];  }  returntmpAry;}