IOS 進度條 progress

@interface MainViewController : UIViewController
@property (strong, nonatomic) IBOutlet UIProgressView *progress;

@property (strong,nonatomic)  NSTimer *timer;
-(IBAction)start:(id)sender;
@end

.m文件

//
//  MainViewController.m
//  ActionSheet
//
//  Created by KeyrunIOSX on 14-3-12.
//  Copyright (c) 2014年 KeyrunIOSX. All rights reserved.
//

#import "MainViewController.h"

@interface MainViewController ()

@end

@implementation MainViewController
@synthesize progress;
@synthesize timer;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}
//自定義方法
-(void)start:(id)sender{
    progress.progress=0.0;
    timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(update) userInfo:nil repeats:YES];
}
-(void )update{
    progress.progress =progress.progress+0.1;//進度前進0.1
    if (progress.progress==1.0) {
        [timer invalidate];
         UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"" message:@"下載完成" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"安裝",nil];
        [alert show];
        [alert release];
    }
   
    
}
-(void)dealloc{
    [progress release];
    [timer release];
    [super dealloc];
}
@end