UI学习笔记---第六天

UIControl及其子类

UISegmentedControl的用法

UISegmentedControl是iOS中得分段控件,每个segment都能被点击,相当于集成了若干个button.通常我们会点击不同的segment来切换不同的view

常用方法

initWithItems: //UISegmentedControl独有的初始化方法,⽤用来创建多个分段

setTitle: forSegmentAtIndex: //为指定下标的分段设置title

setImage: forSegmentAtIndex: //为指定下标的分段设置image insertSegmentWithTitle:

 atIndex:animated: //指定下标插入分段　

- (void)viewDidLoad
{
    [super viewDidLoad];
    UIImage *image = [UIImage imageNamed:@"3005.png"];
    NSArray *arr = @[@"分组",@"全部",@"推荐",@"共享",image];
    UISegmentedControl *segmentcontrol = [[UISegmentedControl alloc] initWithItems:arr];
    segmentcontrol.frame = CGRectMake(60, 100, 200, 30);
    [segmentcontrol addTarget:self action:@selector(choose:) forControlEvents:UIControlEventValueChanged];
    segmentcontrol.selectedSegmentIndex = 2;//开始的时候就选中一个下标
    [self.view addSubview:segmentcontrol];
    [segmentcontrol release];

UISlider概述

UISlider是iOS中的滑块控件,通常用于控制视频播放进度,控制音量等,它也是继承于UIControl,滑块提

供了⼀系列连续的值,滑块停 在不同的位置,获取到滑块上的值也不同。

常用属性

minimumValue //设置滑块的最⼩小值 

maximumValue //设置滑块的最⼤大值 

value //设置滑块的当前值

addTarget: action: forControlEvents: 给UISlider添加事件, controlEvent为UIControlEventValueChanged。

UIImageView的使用

- (void)speed:(UISlider *)slider
{
    UIImageView *imgv = (UIImageView *)[self.view viewWithTag:999];
    [imgv stopAnimating];
    imgv.animationDuration = slider.value;
    [imgv startAnimating];
}
- (void)viewDidLoad
{
    [super viewDidLoad];

    
    
    
    UIImageView *imageview = [[UIImageView alloc] initWithFrame:CGRectMake(120, 140, 68, 68)];
    imageview.backgroundColor = [UIColor orangeColor];
    NSMutableArray *images = [NSMutableArray arrayWithCapacity:10];
    for (int i = 1; i <= 5; i++) {
        NSString *imagename = [NSString stringWithFormat:@"I]WXR8([Y]TFLAECY8EO2%%2－%d（被拖移）.tiff",i];
        UIImage *image = [UIImage imageNamed:imagename];
        [images addObject:image];
    }
    imageview.animationImages = images;
    imageview.animationDuration = 1;//动画播几次要用多长时间
//    imageview.animationRepeatCount = -1;
    [imageview startAnimating];
    [self.view addSubview:imageview];
    imageview.tag = 999;
    [imageview release];
    
    UISlider *slider = [[UISlider alloc] initWithFrame:CGRectMake(10, 420, 300, 20)];
    [self.view addSubview:slider];
    [slider addTarget:self action:@selector(speed:) forControlEvents:UIControlEventValueChanged];
    [slider release];
}

image //设置图⽚片

animationImages //设置一组动态图片 

animationDuration //设置播放一次一组动态图片的时间 

animationRepeatCount //设置重复次数 

startAnimating //开始动画

stopAnimating //结束动画

UIControl的作用

UIControl是所有控制控件(比如UIButton  UISlider  UISegmentedControl等)的基类,只要跟控制有关的控件都是继承于该类

UIControl的核心功能是可以为控制控件通过addTarget:action:forControlEvents:方法来添加事件.也可以通过removeTarget:action:forControlEvents:来移除事件