一、userInfo

//userInfo：在timer里要对哪个对象操作，就传入哪个对象
    NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(drinkAnimation:) userInfo:drinkImgView repeats:YES];

二、项目:HmWork_PlayBall_Teacher0303

    //定义好初始速度
    offSet_x = 2;//x方向速度
    offSet_y = 3;//y方向速度
//球移动的方法
- (void)ballMove:(NSTimer *)timer1
{
    UIImageView *ballImgView = timer1.userInfo;
    CGRect ballRect = ballImgView.frame;
    //判断是否到达 左右边界
    if (ballImgView.frame.origin.x > self.window.bounds.size.width - 60 || ballImgView.frame.origin.x < 0)
    {
        offSet_x = -offSet_x;
    }
    //判断是否到达 上下边界
    if (ballImgView.frame.origin.y > self.window.bounds.size.height - 60 || ballImgView.frame.origin.y < 0)
    {
        offSet_y = -offSet_y;
    }
    ballRect.origin.x = ballRect.origin.x + offSet_x;
    ballRect.origin.y = ballRect.origin.y + offSet_y;
    
    ballImgView.frame = ballRect;
}

三、数组
项目：Array_Demo

    //数组：一组有序数据的集合
    //特点：数据存放是有序的，并且不允许出现空缺。
    //     每个元素都有索引值，按照索引值从小到大顺序排列
    //限制：只能存放对象类型，不能存放基本数据类型    
    //种类：1.不可变数组 NSArray 2.可变数组 NSMutableArray
    
    //1.创建 NSArray**********************************************
    //a.创建并初始化之后，不能修改数据
    NSArray *array = [[NSArray alloc]initWithObjects:@"张三",@"李四",@"王五",@"小红",@"23",nil];
    //b.拿到数组后，如何获取数组中元素的个数
    int number = array.count;
    //c.获取和查看组中的元素
    NSString *object = [array objectAtIndex:0];
    for (int a = 0; a < array.count; a++) 
 {
        object = [array objectAtIndex:a];
        NSLog(@"%@",object);
    }
    
    //2.创建 NSMutableArray**********************************************

    //a. 初始化方法1.init 2.initWithObjects 3.initWithCapacity(容量)
    NSMutableArray *mutableArray = [[NSMutableArray alloc]initWithObjects:@"1",@"2",@"3",@"4", nil];
    //b.增加数据
    [mutableArray addObject:@"5"];
    //b.1 增加大量、有规律的数据
    for (int i = 6; i < 21; i++)
    {
        NSString *str = [NSString stringWithFormat:@"%d",i];
        [mutableArray addObject:str];
    }
    //c.删除数据
    //  1.removeObjectAtIndex 
    //  2.removeObject
    [mutableArray removeObject:@"20"];  
    //[mutableArray removeObjectAtIndex:19];  

    //d.替换数据
    [mutableArray replaceObjectAtIndex:18 withObject:@"29"];
    //e.插入操作
    [mutableArray insertObject:@"小明" atIndex:19];
    //f.交换
    [mutableArray exchangeObjectAtIndex:0 withObjectAtIndex:15];
    //g.获取数组中每一个元素，方式都与不可变数组一样
    return YES;

四、帧动画
项目：Frame_Animation

    //帧动画 系统提供的 基于 UIImageView 的帧动画
    //1.创建图片视图，展示动画的每一张图片
    _fireImgView = [[UIImageView alloc]initWithFrame:self.window.frame];
    _fireImgView.image = [UIImage imageNamed:@"fire.png"];
    [self.window addSubview:_fireImgView];
    
    //2.设置：3个属性+1个方法
    //即：animationImages、animationDuration、animationRepeatCount
    //2.1 属性1 设置动画所需图片
    NSMutableArray *imageArray = [[NSMutableArray alloc]init];
    for (int i = 0; i < 17; i++)
    {
        NSString *name = [NSString stringWithFormat:@"Fire%d.gif",i+1];
        UIImage *image = [UIImage imageNamed:name];
        [imageArray addObject:image];
    }
    _fireImgView.animationImages = imageArray;
    //2.2 属性2 设置动画时间间隔
    _fireImgView.animationDuration = 0.01 * imageArray.count;
    //2.3 属性3 是否重复
    _fireImgView.animationRepeatCount = LONG_MAX;//0或者LONG_MAX
    //3.添加开始/停止按钮
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    button.frame = CGRectMake(40, 40, 40, 40);
    [button setTitle:@"开始/停止" forState:UIControlStateNormal];
    [button setBackgroundImage:[UIImage imageNamed:@"play"] forState:UIControlStateNormal];
    [button addTarget:self action:@selector(startAndStop:) forControlEvents:UIControlEventTouchUpInside];
    [self.window addSubview:button];
    return YES;