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数组创建 NSArray *array1 = [NSArray arrayWithObject: @”rose”]; NSArray *array2 = [NSArray arrayWithObjects: @”jack”, @”jay”, nil]; NSArray *array3 = @[@”rain”, @”carlo”, @”Richard”]; 数组访问 [array3 objectAtIndex: 1]; NSLog(@”%@”, array3[1]); // 编译器特性
数组长度 [array3 count]; // count是get方法，返回值为unsigned long，所以输出格式为%ld array3.count; 数组遍历 循环结构 for(int i=0; i<array3.count; i++) { NSLog(@”array3[%d] = %@”, i, array3); } 快速遍历 for(id obj in array) { NUInteger i = [array indexOfObject: obj]; NSLog(@”array3[%ld] = %@”, i, obj); } block遍历 [array3 enumerateObjectsUsingBlock: ^(id obj, NUInteger idx, bool *stop) { NSLog(@”array3[%ld] = %@”, idx, obj); if (idx==1) { *stop = YES; } }]; 补充： 字符串->数组 NSString *str = @”jack-rose-jim-jay-rain-richard” NSArray *array = [str componentsSeperatedByString:@”-”]; // 字符串分解为数组 可变数组 创建 NSMutableArray *array1 = [[NSMutableArray alloc] initWithObjects:@”rose”, @”jack”, nil]; 添加元素 NSMutableArray *array2 = [array1 addObject:@”rain”]; Person *p = [[Person alloc] init]; NSMutableArray *array3 = [array2 addObject: p]; 删除元素 NSMutableArray *array4 = [array3 deleteObject: @”rain”]; NSMutableArray *array5 = [array4 deleteObjectAtIndex:2]; NSMutableArray *array6 = [array5 removeAllObjects]; 打印数组 NSLog(@”%@”, array4);
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