UIButtonAndNSTimer

一、UIButton（按钮）

1、按钮风格(系统、自定义)

//按钮风格
- (void)buttonStytle
{
    /*
     系统默认
     UIButtonTypeSystem
     显示详情
     UIButtonTypeDetailDisclosure
     UIButtonTypeInfoLight
     UIButtonTypeInfoDark
     一个'+'
     UIButtonTypeContactAdd
     UIButtonTypeRoundedRect = UIButtonTypeSystem
     */
    UIButton *button = [UIButton buttonWithType:UIButtonTypeContactAdd];
    button.frame = CGRectMake(100, 50, VIEW_WIDTH-200, 50);
    button.backgroundColor = [UIColor redColor];
    //设置着色（系统默认的是蓝色）
    //button.tintColor = [UIColor whiteColor];
    //可以解决圆角问题
    button.layer.cornerRadius = 10;

    [self.view addSubview:button];
}

2、基本属性(标题、颜色、状态)

//基本属性
- (void)baseAttributes
{
    //自定义风格没有按下的效果
    UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];
    button.frame = CGRectMake(100, 150, VIEW_WIDTH-200, 100);
    button.backgroundColor = [UIColor greenColor];

    //这种方式只能设置颜色，文本
    button.titleLabel.font = [UIFont systemFontOfSize:50];
    //设置标题
    //正常状态
    [button setTitle:@"正常" forState:UIControlStateNormal];
    //标题颜色
    [button setTitleColor:[UIColor purpleColor] forState:UIControlStateNormal];
    //高亮状态
    [button setTitle:@"高亮" forState:UIControlStateHighlighted];
    [button setTitleColor:[UIColor whiteColor] forState:UIControlStateHighlighted];
    //高亮状态发光效果开关
    button.showsTouchWhenHighlighted = YES;
    //禁用状态，button.enabled为NO时有效
    [button setTitle:@"禁用" forState:UIControlStateDisabled];
    [button setTitleColor:[UIColor grayColor] forState:UIControlStateDisabled];
    //button.enabled = NO;
    //选中状态，button.selected为YES时有效
    [button setTitle:@"选中" forState:UIControlStateSelected];
    [button setTitleColor:[UIColor redColor] forState:UIControlStateSelected];
    button.selected = YES;
    //选中状态标题label的背景色
    button.tintColor = [UIColor yellowColor];

    [self.view addSubview:button];
}

3、图片及边界(背景、内容、边界、渲染模式)

//设置背景图片和和图片和title布局
- (void)iconAndEdge
{
    UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];
    button.frame = CGRectMake(100, 300, VIEW_WIDTH-200, 200);
    button.backgroundColor = [UIColor blueColor];
    //设置背景图(小了拉伸，大了压缩)
    [button setBackgroundImage:[UIImage imageNamed:@"start"] forState:UIControlStateNormal];
    //设置图标
    //设置渲染模式
    UIImage *image = [[UIImage imageNamed:@"webChat"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
    [button setImage:image forState:UIControlStateNormal];
    //设置标题
    [button setTitle:@"标题" forState:UIControlStateNormal];
    [button setTitleColor:[UIColor greenColor] forState:UIControlStateNormal];
    button.titleLabel.font = [UIFont systemFontOfSize:25];
    //既有图标又有标题时，默认居中布局
    //设置对齐方式
    button.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;
    button.contentVerticalAlignment = UIControlContentVerticalAlignmentTop;
    //适应字体及内容，否则titleLabel的尺寸为(0,0)
    [button.titleLabel sizeToFit];
    //NSLog(@"label:%@", NSStringFromCGRect(button.titleLabel.frame));
    CGSize titleSize = button.titleLabel.frame.size;
    CGSize buttonSize = button.frame.size;
    //设置图标四周边界
    [button setImageEdgeInsets:UIEdgeInsetsMake((buttonSize.height-image.size.height-titleSize.height)/2, (buttonSize.width-image.size.width)/2, 0, 0)];
    //设置标题四周边界
    [button setTitleEdgeInsets:UIEdgeInsetsMake((buttonSize.height+image.size.height-titleSize.height)/2, (buttonSize.width-titleSize.width)/2-image.size.width, 0, 0)];

    [self.view addSubview:button];
}

4、添加事件及处理方法

//添加点击事件
- (void)createButtonOne
{
    UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];
    button.frame = CGRectMake(100, 100, VIEW_WIDTH-200,100);
    button.backgroundColor = [UIColor redColor];
    button.showsTouchWhenHighlighted = YES;
    button.layer.cornerRadius = 15;
    /*添加事件
     参数1:事件由谁(哪个对象)来处理
     参数2:事件怎么处理(处理方法)
     参数3:什么事件
     UIControlEventTouchUpInside    按下并在一定范围内抬起
     UIControlEventTouchUpOutside   按下并在一定范围外抬起
     */
    [button addTarget:self action:@selector(buttonClick) forControlEvents:UIControlEventTouchUpInside];
    [button addTarget:self action:@selector(buttonHandle) forControlEvents:UIControlEventTouchUpOutside];
    [self.view addSubview:button];
}

- (void)buttonClick
{
#define Random  arc4random()%256/255.0
    self.view.backgroundColor = [UIColor colorWithRed:Random green:Random blue:Random alpha:1.0];
}

- (void)buttonHandle
{
    self.view.backgroundColor = [UIColor whiteColor];
}

- (void)createButtonTwo
{
    UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];
    button.frame = CGRectMake(100, 250, VIEW_WIDTH-200,100);
    button.backgroundColor = [UIColor greenColor];
    button.showsTouchWhenHighlighted = YES;
    button.layer.cornerRadius = 15;

    [button setTitle:@"开始" forState:UIControlStateNormal];
    button.titleLabel.font = [UIFont systemFontOfSize:50];

    [button addTarget:self action:@selector(changeTitle:) forControlEvents:UIControlEventTouchUpInside];

    [self.view addSubview:button];
}

- (void)changeTitle:(UIButton *)button
{
    NSString *title = button.currentTitle;
    if ([title isEqualToString:@"开始"]) {
        [button setTitle:@"暂停" forState:UIControlStateNormal];
    } else {
        [button setTitle:@"开始" forState:UIControlStateNormal];
    }
}

5、UILabel&UIButton使用

//创建Label
- (void)createLabel
{
    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(100, 100, VIEW_WIDTH- 200,100)];
    label.backgroundColor = [UIColor redColor];
    label.textAlignment = NSTextAlignmentCenter;
    label.font = [UIFont systemFontOfSize:50];
    label.textColor = [UIColor whiteColor];
    label.text = @"0";
    label.tag = 100;
    [self.view addSubview:label];
    [label release];
}
//创建Button
- (void)createButton
{
    UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];
    button.frame = CGRectMake(100, 250, VIEW_WIDTH-200, 100);
    button.backgroundColor = [UIColor greenColor];
    button.showsTouchWhenHighlighted = YES;
    button.layer.cornerRadius = 20;

    [button addTarget:self action:@selector(addNumber) forControlEvents:UIControlEventTouchUpInside];
    [button addTarget:self action:@selector(clearNumber) forControlEvents:UIControlEventTouchUpOutside];

    [self.view addSubview:button];
}
//button相应事件，改变label值
- (void)addNumber
{
    //找到label
    UILabel *label = (UILabel *)[self.view viewWithTag:100];
    NSInteger number = [label.text integerValue];
    label.text = [NSString stringWithFormat:@"%ld", number+1];
}
//button响应事件，改变label标题显示
- (void)clearNumber
{
    UILabel *label = (UILabel *)[self.view viewWithTag:100];
    label.text = @"0";
}

二、NSTimer（定时器）
1、创建

//创建定时器
- (void)createTimer
{
    /*创建定时器
     参数1:时间间隔，单位为秒
     参数2:事件谁来处理
     参数3:怎么处理
     参数4:传递的参数
     参数5:是否重复
     */
    _timer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(changeColor:) userInfo:nil repeats:YES];
    //定时器创建后默认是开启的，需要先关闭定时器
    [_timer setFireDate:[NSDate distantFuture]];
}

定时器响应事件

- (void)changeColor:(NSTimer *)timer
{
#define Random  arc4random()%256/255.0
    self.view.backgroundColor = [UIColor colorWithRed:Random green:Random blue:Random alpha:1.0];
}

2、开启
3、关闭
创建Button响应事件进行改变定时器状态

- (void)createButton
{
    UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];
    button.frame = CGRectMake(100, 200, self.view.frame.size.width-200, 100);
    button.backgroundColor = [UIColor greenColor];
    button.layer.cornerRadius = 20;
    button.showsTouchWhenHighlighted = YES;
    [button setTitle:@"开始" forState:UIControlStateNormal];
    button.titleLabel.font = [UIFont systemFontOfSize:50];
    [button addTarget:self action:@selector(changeStatus:) forControlEvents:UIControlEventTouchUpInside];

    [self.view addSubview:button];
}

- (void)changeStatus:(UIButton *)button
{
    NSString *title = button.currentTitle;
    if ([title isEqualToString:@"开始"]) {
        //将定时器的开启时间设置为很久以前的一个时间会开启定时器
        [_timer setFireDate:[NSDate distantPast]];
        [button setTitle:@"暂停" forState:UIControlStateNormal];
    } else {
        //将定时器的开启时间设置为将来的一个时间会关闭定时器
        [_timer setFireDate:[NSDate distantFuture]];
        [button setTitle:@"开始" forState:UIControlStateNormal];
    }
}

4、销毁

- (void)dealloc
{
    if (_timer.isValid) {
        //让定时器失效
        [_timer invalidate];
        _timer = nil;
    }
    [super dealloc];
}

三、坐标系相关结构
1、CGPoint、CGSize、CGRect
CGPoint：点，用于描述视图的位置
CGSize：尺寸，用于描述视图的位置
CGRect：矩形，既有位置CGPoint ，又有CGSize，大小
2、frame：描述视图在父视图中的位置及大小
是相对于父视图的坐标系
3、center：视图的中心点，修改它会影响frame
4、bounds：边界，原点会影响子视图的位置，大小会影响frame
是相对于自身的坐标系的
5、transform：形变属性，比如：平移、缩放、旋转

//视图的旋转和平移
- (void)createSceneTwo
{
    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(100, 350, 100, 150)];
    view.backgroundColor = [UIColor blueColor];

    //平移(x'=x+100,y'=y+50)
    view.transform = CGAffineTransformMakeTranslation(100, 150);
    //缩放(x'=2*x,y'=0.5*y)，中心点不变
    view.transform = CGAffineTransformMakeScale(4,0.5);
    //旋转，角度单位是弧度，顺时针为正
    view.transform = CGAffineTransformMakeRotation(M_PI_4);

    //以上三种方式效果不叠加，若想效果叠加可以使用以下方式

    //view.transform = CGAffineTransformRotate(view.transform, M_PI_2);
    //view.transform = CGAffineTransformScale(view.transform, 2, 0.5);
    view.transform = CGAffineTransformTranslate(view.transform, 100, 50);

    //取消所有形变设置
    //view.transform = CGAffineTransformIdentity;


    [self.view addSubview:view];
    [view release];
}