UIProgressView

iOS进度条实现

最新推荐文章于 2024-04-28 17:19:55 发布

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最新推荐文章于 2024-04-28 17:19:55 发布

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原文链接：http://www.cnblogs.com/li625317534/p/5047959.html

本文介绍了一个简单的iOS应用案例，展示了如何使用Swift实现进度条的显示和动态更新，并通过按钮控制进度条的变化。

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

转载于:https://www.cnblogs.com/li625317534/p/5047959.html