iOS 学习笔记（随记）

加载nib：

使用指定初始化器（designated initializer）让ViewController知道要加载哪个nib

- (instancetype)initWithNibName:(NSString *)nibName bundle:(NSBundle *)nibBuddle;

NSBundle *appBundle = [NSBundle mainBundle];

BNRReminderViewController *rvc = [[BNRReminderViewController alloc]initWithNibName:@"BNRReminderViewController" bundle:appBundle];

添加一个SegmentedControl：

        //初始化

        UISegmentedControl *segmentedControl =[[UISegmentedControl alloc] initWithItems:@[@"Red", @"Green", @"Blue"]];

        //设置大小和位置

        segmentedControl.frame = CGRectMake(35, 480, 250, 20);

        //默认选择

        segmentedControl.selectedSegmentIndex = 0;

        [segmentedControl addTarget:self

                             action:@selector(changeColor:)

                   forControlEvents:UIControlEventValueChanged];

        [self.view addSubview:segmentedControl];

- (void)changeColor:(id)sender

{

    UISegmentedControl *segmentedControl = (UISegmentedControl *) sender;

    NSLog(@"The Segment controller was touched %d", segmentedControl.selectedSegmentIndex);

    if(segmentedControl.selectedSegmentIndex == 0){

        ((BNRHypnosisView *)self.view).circleColor = [UIColor redColor];

    }

    if(segmentedControl.selectedSegmentIndex == 1){

        ((BNRHypnosisView *)self.view).circleColor = [UIColor greenColor];

    }

    if(segmentedControl.selectedSegmentIndex == 2){

        ((BNRHypnosisView *)self.view).circleColor = [UIColor blueColor];

    }

}

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