ios 初体验< UISegmentedControl 分段控件>

 小知识：  数组快速创建 @[@"",@"",@"",@"".......],字典快速创建方法：@{@"",@"",@"",@""......} ,可变，和不可变，

快速实例化一个 UISegmentedControl *segmentedContrl = [[UISegmentedControl alloc]initWithItems:@[@"红色",@"黄色",@"灰色"]];  //里面装的是个数组

　UISegmentedControl 继承自UIControl  添加点击事件

　　设置其位置 通过获取 屏幕居中点　

　segmentedContrl.bounds = CGRectMake(0, 0, 250, 30);

segmentedContrl.center = CGPointMake(self.view.center.x, self.view.center.y + 15);

默认选中由于里面是个数组

segmentedContrl.selectedSegmentIndex = 0 ;

默认字体 从字典里面去取

[segmentedContrl setTitleTextAttributes:@{NSForegroundColorAttributeName:[UIColor orangeColor]} forState:UIControlStateNormal];

添加事件

[segmentedContrl addTarget:self action:@selector(controlProgress:) forControlEvents:UIControlEventValueChanged];

[self.view addSubview:segmentedContrl];

点击事件

- (void)controlProgress:(UIView *)sender{

//判断该对象是否是 switch 类

if ([sender isKindOfClass:[UISwitch class]]) {

强转 判断传进来是

UISwitch *switchContol = (UISwitch *)sender;

条件表达式 判断开关动画的显示

switchContol.on ? [_indicatorView startAnimating]:[_indicatorView stopAnimating];

}

if ([sender isKindOfClass:[UISlider class]]) {

强转

UISlider *slider = (UISlider *)sender;

self.view.alpha = slider.value;

}

if ([sender isKindOfClass:[UISegmentedControl class]]) {

强转

UISegmentedControl *segmentedContrl = (UISegmentedControl *)sender;

把颜色存入一个数组

NSArray *colorArry = @[[UIColor redColor],[UIColor yellowColor],[UIColor grayColor]];

改变颜色

self.view.backgroundColor = colorArry[segmentedContrl.selectedSegmentIndex];

}

}