UIProgressView

UIProgressView顾名思义用来显示进度的，如音乐，视频的播放进度，和文件的上传下载进度等。

下面以一个简单的实例来介绍UIprogressView的使用。



@interface ActivityViewController : UIViewController

{

UIProgressView *proView;

double proValue;

NSTimer *timer;

}

@property(nonatomic, retain) UIProgressView *proView;

-(IBAction)btnStartClick;

@implementation ActivityViewController

@synthesize proView;

#pragma mark - View lifecycle

-(IBAction)btnStartClick

{

proValue=0;

timer = [NSTimerscheduledTimerWithTimeInterval:1target:selfselector:@selector(changeProgress) userInfo:nilrepeats:YES]; //利用计时器，每隔1秒调用一次（changeProgress）

}

-(void)changeProgress

{

proValue += 1.0; ／／改变proValue的值

if(proValue > 5)

{

//停用计时器

[timer invalidate];

}

else

{

[proViewsetProgress:(proValue / 5)];//重置进度条

}

}

- (void)viewDidLoad

{

proView = [[UIProgressViewalloc] initWithFrame:CGRectMake(100, 100, 150, 20)];

[proViewsetProgressViewStyle:UIProgressViewStyleDefault]; //设置进度条类型

[self.viewaddSubview:proView];

[superviewDidLoad];

}