UIprogressView

UIProgressView 进度指示器

UIProgressView 与UIActivityIndicatorView 相似,只不过它提供了一个接口让你可以显示一个类似进度条的东西,这样就能让用户知道当前操作完成了多少(告知用户离操作结束还多远)。

一.创建

UIProgressView* progressView = [ [ UIProgressView alloc ]

initWithFrame:CGRectMake(150.0,20.0,130.0,30.0)];

二.设置风格:

progressView .UIProgressViewStyle= UIProgressViewStyleDefault;

系统给你提供了2种风格:

UIProgressViewStyleDefault 标准进度条

UIProgressViewStyleDefault 深灰色进度条,用于工具栏中

三.显示

[ self.toolBar addSubview:progressView ];

四.进度

当它显示出来时你的程序可以更新它的进度,属性progress是一个0.0到1.0之间的浮点数:

progressView.progress= 0. 5;

五.示例代码

4.09UIProgressView(1)

- (void)progressChanged:(NSTimer*)timer

{

if(_progressView.progress>=1.0) {

[timerinvalidate];

}

//如果对象的progress大于1.0,则定时器失效

_progressView.progress+=0.02;

//让对象的progress值每次都加0.02,以此达到让进度动起来的效果。

}

- (void)viewDidLoad

{

[superviewDidLoad];

self.progressView= [[UIProgressViewalloc]init];

//创建一个UIProgressView对象:_progressView

_progressView.frame=CGRectMake(0,20,320,0);

//设置它的位置及大小,它的高是默认的为9,可以写成0。

_progressView.progressViewStyle=UIProgressViewStyleDefault;

//设置它的风格,为默认的

_progressView.trackTintColor= [UIColorblueColor];

//设置轨道的颜色

_progressView.progressTintColor= [UIColorwhiteColor];

//设置进度的颜色

_progressView.progress=0.0;

//设置进度的初始值,即初始位置。范围是0.0-1.0

[self.viewaddSubview:_progressView];

//把_progressView加入到view上

[_progressViewrelease];

//要记得release

[NSTimerscheduledTimerWithTimeInterval:0.5

target:self

selector:@selector(progressChanged:)

userInfo:nil

repeats:YES];

//设置定时器

}



第二种介绍

UIProgressView:

作用:

动态显示当前工作状态进度。

progressView

Progress bar view

1.h file

//  Created by denny chen on 12-7-8.

//  Copyright (c) 2012年__MyCompanyName__. All rights reserved.

//

#import

@interfaceProgressViewViewController :UIViewController

{

UIProgressView*progressview;

UIProgressView*barprogressview;

NSTimer*timer;

IBOutletUIButton*startButton;

IBOutletUIButton*stopButton;

}

@property(nonatomic,retain)IBOutletUIProgressView*progressview;

@property(nonatomic,retain)IBOutletUIProgressView*barprogressview;

-(IBAction) startProgress:(id)sender;

-(IBAction) stopProgress:(id)sender;

@end

2 .m file

@implementationProgressViewViewController

@synthesizeprogressview;

@synthesizebarprogressview;

- (void)viewDidLoad

{

self.progressview=nil;

self.barprogressview=nil;

[superviewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

stopButton.enabled=NO;

startButton.enabled=YES;

}

-(void) dealloc

{

self.progressview=nil;

self.barprogressview=nil;

[superdealloc];

}

- (void)viewDidUnload

{

self.progressview=nil;

self.barprogressview=nil;

[superviewDidUnload];

// Release any retained subviews of the main view.

}

/*进度条每次加0.01 */

-(void) timerChanged:(id)sender

{

self.progressview.progress+=0.01f;

self.barprogressview.progress+=0.01f;

}

-(IBAction) startProgress:(id)sender

{

timer=[NSTimerscheduledTimerWithTimeInterval:0.03f

target:self

selector:@selector(timerChanged:)

userInfo:nil

repeats:YES];

//[timerretain];

startButton.enabled=NO;

stopButton.enabled=YES;

}

-(IBAction) stopProgress:(id)sender

{

[timerinvalidate];

//[timerrelease];

//timer=nil;

self.progressview.progress=0.0f;

self.barprogressview.progress=0.0f;

startButton.enabled=YES;

stopButton.enabled=NO;

}

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