汇总：风火轮，进度条，页面指示器

UIActivityIndicatorView

风火轮 

//UIActivityIndicatorView :风火轮
//UIActivityIndicatorViewStyleWhite 设置风格 ，一共有三种

UIActivityIndicatorView *indicator= [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite];

//设置背景颜色
indicator.backgroundColor= [UIColorredColor];

//透明度
indicator.alpha= 0.5;

//设置中心点
indicator.center=self.view.center;

//bounds大小
indicator.bounds=CGRectMake(0, 0, 50, 50);

//设置圆角
indicator.layer.cornerRadius= 10;

//超出父视图部分不显示
indicator.layer.masksToBounds=YES;

//添加到屏幕上
[self.viewa ddSubview:indicator];

//开始风火轮动画
[indicator startAnimating];

//停止风火轮动画
[indicator stopAnimating];

UIProgressView

进度条 

// UIProgressView:进度条

UIProgressView *progress= [[UIProgressView alloc] initWithProgressViewStyle:UIProgressViewStyleDefault];

//设置进度条的位置和大小
progress.frame=CGRectMake(20, 80, 100, 30);

//progress.tintColor = [UIColor redColor];
//progress.backgroundColor = [UIColor purpleColor];
//progress.alpha = 0.5;

//进度值设置属性为progress
progress.progress= 0.1f;

//控制走过的轨迹的颜色
progress.progressTintColor= [UIColorgreenColor];

//未走过的颜色
progress.trackTintColor= [UIColorgrayColor];

//添加到视图上
[self.view addSubview:progress];

//setProgress设置平缓过度到某一个位置的方法
//[progress setProgress:0.8f animated:YES];

UIPageControl
页面指示器 

//指示器页面小圆点 ，通常和scrollView或者其子类一起使用 ，利用定时器来改变
UIPageControl *page= [[UIPageControl alloc] initWithFrame:CGRectMake(([[UIScreenmain Screen]bounds].size.width-100)/2.0, 100, 100, 40)];

//点数页数
page.numberOfPages= 7;

//page.backgroundColor = [UIColor orangeColor];
//点点的颜色
page.pageIndicatorTintColor= [UIColorgreenColor];

//page.tintColor = [UIColor greenColor];

//当前页点的颜色
page.currentPageIndicatorTintColor= [UIColororangeColor];

//当前显示页面
page.currentPage= 2;

[self.view addSubview:page];

[NSTimerscheduledTimerWithTimeInterval:1target:selfselector:@selector(move)userInfo:nilrepeats:YES];

- (void)move {
staticinta=0;
staticinti= 1;
a +=i;
page.currentPage= a;
if(a==6) {
i=-1;
} if(a==0){
i=1;
}
}