6.3 几个控件以及Block的使用

1，UILabel ,
2，UISegmentedControl ,UISwitch,UISlider,UIProgress,
3，UIActivityIndicatorView,
4，UIAlertView
5，UIAlertViewDelegate
6，Block

#pragma mark - UILabel 文本自适应    UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(10, 300, 200, 0)];    // 设置文本    label.text = @"你好，UI！你好，UI！你好，UI！你好，UI！你好，UI！你好，UI！你好，UI！你好，UI！";    // 设置无限行数    label.numberOfLines = 0;    // 系统自动适应当前文本，并且设置相应大小    [label sizeToFit];    // 添加到父视图    [self.view addSubview:label];

#pragma mark - UISegmentedControl 分段控件    UISegmentedControl *segControl = [[UISegmentedControl alloc]initWithItems:@[@"红色",@"蓝色"]];    //设置中心点    segControl.center = CGPointMake(187, 40);    // 添加到父视图    [self.view addSubview:segControl];    // 设置主色调    segControl.tintColor = [UIColor purpleColor];    // 添加事件：    [segControl addTarget:self action:@selector(stream:handleEvent:) forControlEvents:UIControlEventValueChanged];

#pragma mark - UISwith 开关    UISwitch *switchControl = [[UISwitch alloc]init];    //设置中心点    switchControl.center = CGPointMake(100, 400);    //添加到视图    [self.view addSubview:switchControl];    // 设置主色调    switchControl.tintColor = [UIColor lightGrayColor];    //开启色调    switchControl.onTintColor = [UIColor brownColor];    //设置按钮色调    switchControl.thumbTintColor = [UIColor purpleColor];    //添加事件    [switchControl addTarget:self action:@selector(handleEvent:) forControlEvents:UIControlEventValueChanged];

#pragma mark - UISlider 滑条    UISlider *slider = [[UISlider alloc]initWithFrame:CGRectMake(0, 200, 375, 20)];    //    //slider.center = CGPointMake(100, 190);    [self.view addSubview:slider];    //添加按钮颜色    slider.thumbTintColor = [UIColor redColor];    //设置色调    slider.maximumTrackTintColor = [UIColor whiteColor];    slider.minimumTrackTintColor = [UIColor blueColor];    //添加事件    [slider addTarget:self action:@selector(handleEvent:) forControlEvents:UIControlEventValueChanged];

#pragma mark - UIProgress 进度条    UIProgressView *progeressView = [[UIProgressView alloc]initWithFrame:CGRectMake(0, 200, 375, 20)];    [self.view addSubview:progeressView];    // 设置颜色    progeressView.trackTintColor = [UIColor redColor];    progeressView.progressTintColor = [UIColor blueColor];    // 设置标签值    progeressView.tag = 100;

#pragma mark - UIActivityIndicatorView 活动指示器    UIActivityIndicatorView *indicatorView = [[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];    [indicatorView setBounds:CGRectMake(9, 9, 30, 30)];    [indicatorView setCenter:CGPointMake(180, 400)];    [self.view addSubview:indicatorView];    //设置停止时候是否隐藏（默认yes）    indicatorView.hidesWhenStopped = NO;    //开启动画    [indicatorView startAnimating];    //进行关联    self.indicatorView = indicatorView;    // 延迟调用方法(dis-after)    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(3 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{        NSLog(@"hihi");        [self.indicatorView  stopAnimating];

#pragma mark - UIAlertView警告框        UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"八嘎" message:@"要停了" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"确定", nil];        //展示        [alertView show];        //    });    //}#pragma mark - UIAlertViewDelegate- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{    if (buttonIndex == 0) {        NSLog(@"取消");    } else {        NSLog(@"确定");    }}

- (void)handleEvent:(id)sender {    if ([sender isKindOfClass:[UISegmentedControl class]]) {        // 强转        UISegmentedControl *seg = (UISegmentedControl *)sender;        if (seg.selectedSegmentIndex == 0) {            self.view.backgroundColor = [UIColor blueColor];        } else        {            self.view.backgroundColor = [UIColor grayColor];        }    }else if ([sender isKindOfClass:[UISwitch class]]) {        UISwitch *switchControl = (UISwitch *)sender;//弱引用        if (switchControl.isOn) {            self.view.backgroundColor = [UIColor blueColor];        } else {            self.view.backgroundColor = [UIColor grayColor];        }        } else if([sender isKindOfClass:[UISlider class]]){        UISlider *slider = (UISlider *)sender;        self.view.alpha = 1 - slider.value;        //通过标签获取视图        UIProgressView *progressView = (UIProgressView *)[self.view viewWithTag:100];        progressView.progress = slider.value;    }}

#pragma mark - Block        //概念：匿名函数（一般用于回调）网络请求        //函数指针与指针函数        //无参无返回值        void (^block) () = ^ {            NSLog(@"hello");        };        //调用        block();        //有参数        void (^logMaxValue)(int a, int b) = ^(int a, int b) {            int max = a > b ? a : b;            NSLog(@"max = %d",max);        };        logMaxValue(10 , 100);#pragma  mark - block 中变量        __block int a = 100;        __block char *str = "hello";        char *str1 = "hello";        void (^testBlock)() = ^ {            NSLog(@"%d",a);            NSLog(@"str = %s,str1 = %s",str,str1);            a = 100;        };        str = "world";        str1 = "world";        a =50;        testBlock();