//数组可以一次性添加完，以nil作为结尾标志

    NSArray *array = [NSArray arrayWithObjects:@"user",@"data", nil];

    //如果添加空的话，可以用以下方法

    NSArray *array1 = [NSArray arrayWithObjects:@"user",[NSNull null], nil];

    //可以建立可变更的数组，并设置一个初始量

    NSMutableArray  *array2 = [NSMutableArray arrayWithCapacity:];

    //可动态添加数组元素

    [array2 addObject:@"user"];

    [array2 addObject:@"data"];

    //合并字符串数组

    NSString *str = [array2 componentsJoinedByString:@"|"];

    //字符串切割成数组

    NSArray *array3 = [str componentsSeparatedByString:@"|"];

    //可变数组元素删除,数组从零开始

    [array2 removeObjectAtIndex:];

    NSMutableArray *arr = [[NSMutableArray alloc] init];

    [arr addObject:[NSNumber numberWithInt:]];

    NSLog(@"%@ \n %@ \n %@ \n %@ \n %@ \n %@",array,array1,array2,array3,str,arr);

 //

 //  ViewController.m

 //  随机生成不同颜色的不同位置并移动的动画方块

 //

 //  Created by Jason on 16/10/26.

 //  Copyright © 2016年 Jason. All rights reserved.

 //

 #import "ViewController.h"

 @interface ViewController ()

 @property (weak, nonatomic) IBOutlet UIView *whiteView;

 @end

 @implementation ViewController

 //修改父控件的颜色

 //sender就是我们点击的那个按钮

 - (IBAction)changeFatherViewColor:(UIButton *)sender {

     //获取父控件

     UIView *fatherView = sender.superview;

     //修改父控件的颜色

     fatherView.backgroundColor = [UIColor redColor];

 }

 - (IBAction)changeFatherViewColorRandom:(UIButton *)sender {

     //获取父控件

     UIView  *fatherView = sender.superview;

     //点击获取随机颜色

     //alpha 透明度 0 完全透明 1 表示完全不透明

     float randomR = arc4random_uniform() / 255.0;

     float randomG = arc4random_uniform() / 255.0;

     float randomB = arc4random_uniform() / 255.0;

     UIColor *randomColor = [UIColor colorWithRed:randomR green:randomG blue:randomB alpha:];

     //修改父类的颜色

     fatherView.backgroundColor = randomColor;

 }

 - (IBAction)creatView:(UIButton *)sender {

     UIView *creatView = [[UIView alloc] init];

     [self.whiteView addSubview:creatView];

     creatView.frame = CGRectMake(, , , );

     creatView.backgroundColor = [UIColor redColor];

 }

 - (IBAction)creatViewMove:(UIButton *)sender {

     //创建随机的View

     UIView *createViewMove = [[UIView alloc] init];

     [self.whiteView addSubview:createViewMove];

     //随机颜色和定义大小

     float randomR = arc4random_uniform() / 255.0;

     float randomG = arc4random_uniform() / 255.0;

     float randomB = arc4random_uniform() / 255.0;

     UIColor *randomColor = [UIColor colorWithRed:randomR green:randomG blue:randomB alpha:];

     createViewMove.backgroundColor = randomColor;

     NSInteger ranX = arc4random_uniform();

     NSInteger ranY = arc4random_uniform();

     CGRect ranLocation = CGRectMake(ranX, ranY, , );

     createViewMove.frame = ranLocation;

     [self randomMoveWithView:createViewMove];

 }

 -(void)randomMoveWithView:(UIView *)view{

     //1.计算坐标 随机

     int ranX=arc4random_uniform();

     int ranY=arc4random_uniform();

     //2.修改控件的frame中的origin

     CGRect oldFrame=view.frame;

     oldFrame.origin=CGPointMake(ranX, ranY);

     //3.动画移动

     //3.1动画时间也随机

     [UIView animateWithDuration:0.5 animations:^{

         view.frame=oldFrame;

     } completion:^(BOOL finished) {

         [self randomMoveWithView:view];

     }];

 }

- (IBAction)remoceView:(id)sender {

//清除UIView

for(UIView *view in self.whiteView.subviews ){

if([view isKindOfClass:[UIButton class]]){

continue;

}

[view removeFromSuperview];

}

}

 @end