UIProgressView

一: 效果图

效果描述: 点击开始按钮,进度条随着时间改变

     

二: 工程图

三: 修改工程文件

1. 这里使用手动释放的方法:点击工程名,点击右边的Build Settings,在搜索框中输入gar,把Automatic Reference Counting  改为NO

2. 在AppDelegate.h中,把实例变量window的引用计数方式strong 为retain

3. 在AppDelegate.m中,重写dealloc方法

4. 在AppDelegate.m中,初始化self.window的时候添加自动释放

四: 代码区

AppDelegate.h

#import <UIKit/UIKit.h>

@interface AppDelegate : UIResponder <UIApplicationDelegate>

@property (retain, nonatomic) UIWindow *window;


@end

AppDelegate.m

#import "AppDelegate.h"
#import "RootViewController.h"

@interface AppDelegate ()

@end

@implementation AppDelegate

- (void)dealloc
{
    self.window = nil;
    
    [super dealloc];
}
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
    // Override point for customization after application launch.
    
    RootViewController *rootVC = [[RootViewController alloc] init];
    
    UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:rootVC];
    
    self.window.rootViewController = navigationController;
    
    [rootVC release];
    
    [navigationController release];
    
    
    
    self.window.backgroundColor = [UIColor whiteColor];
    [self.window makeKeyAndVisible];
    return YES;
}

@end

RootViewController.h

#import <UIKit/UIKit.h>

@interface RootViewController : UIViewController

@end

RootViewController.m

#import "RootViewController.h"

 

@interface RootViewController ()

 

// 创建进度条实例变量

@property (nonatomic , retain) UIProgressView *progressView;

 

@end

 

@implementation RootViewController

 

- (void)viewDidLoad {

    [super viewDidLoad];

    // Do any additional setup after loading the view.

    

    // 调用对象,生成progressView

    [self createProgressView];

    

    // 创建控制按钮

    UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];

    

    // 设置按钮位置大小

    button.frame = CGRectMake(120, 200, 80, 30);

    

    // 设置按钮样式,添加文字

    [button setTitle:@"开始" forState:UIControlStateNormal];

    

    // 添加到视图对象

    [self.view addSubview:button];

    

    // 关联方法

    [button addTarget:self action:@selector(beginGame) forControlEvents:UIControlEventTouchUpInside];

    

    

}

 

// 创建progressView对象的方法

-(void)createProgressView {

    

    // 创建progressView对象

    self.progressView = [[UIProgressView alloc] initWithFrame:CGRectMake(30, 150, 260, 0)];

    

    // 设置风格

    _progressView.progressViewStyle = UIProgressViewStyleDefault;

    

    // 设置进度颜色

    _progressView.progressTintColor = [UIColor redColor];

    

    // 设置轨迹色

    _progressView.trackTintColor = [UIColor blackColor];

    

    // 初始化起始位置

    _progressView.progress = 0.0;

    

    // 添加到父视图

    [self.view addSubview:_progressView];

    

    // 释放

    [_progressView release];

}

 

// 按钮事件

- (void)beginGame {

    

    // 初始化progressView的进度位置

    self.progressView.progress = 0.0;

    

    // 设置事件触发时间间隔

    [NSTimer scheduledTimerWithTimeInterval:0.05 target:self selector:@selector(handleProgressBar:) userInfo:nil repeats:YES];

}

 

//

-(void)handleProgressBar:(NSTimer *)timer {

    

    // 防止时间过度递增

    if (_progressView.progress >= 1.0) {

        [timer invalidate]; // 时间终止

    }

    

    // progressView进度累加

    self.progressView.progress +=0.01;

}

 

 

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

 

/*

#pragma mark - Navigation

 

// In a storyboard-based application, you will often want to do a little preparation before navigation

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

    // Get the new view controller using [segue destinationViewController].

    // Pass the selected object to the new view controller.

}

*/

 

@end