闪烁手电筒，制作手电筒应用程序

Question

我正在制作一个手电筒应用程序。

它的功能是1.开/关手电筒，2.闪烁触摸(带开关和滑块(

这是我所有的代码

ViewController.m
//
//  ViewController.m
//  Just Flashlight
//
//  Created by CenoX on 2013. 10. 9..
//  Copyright (c) 2013년 SHIFTstudios. All rights reserved.
//
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    self.blinksliderlabel.text = @"150ms";
}
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}
- (IBAction)flash:(UIButton *)sender {
    AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    if ([device hasTorch] == NO)
    {
        [device setTorchMode:AVCaptureTorchModeOn];
        [_flashton setHighlighted:YES];
    } else {
        [device setTorchMode:AVCaptureTorchModeOff];
        [_flashton setHighlighted:NO];
    }
}
- (IBAction)blinkspeed:(UISlider *)sender {
    int progress = lroundf(sender.value);
    self.blinksliderlabel.text = [NSString stringWithFormat:@"%dms", progress];
}
@end
ViewController.h
//
//  ViewController.h
//  Just Flashlight
//
//  Created by CenoX on 2013. 10. 9..
//  Copyright (c) 2013년 SHIFTstudios. All rights reserved.
//
#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>
@interface ViewController : UIViewController
@property (weak, nonatomic) IBOutlet UIImageView *flashton;
- (IBAction)flash:(UIButton *)sender;
@property (weak, nonatomic) IBOutlet UILabel *blinksliderlabel;
- (IBAction)blinkspeed:(UISlider *)sender;
@property (weak, nonatomic) IBOutlet UISwitch *blinkswitch;

@end

如何闪烁手电筒(手电筒(？

Answer 1

你应该设置一个 NSTimer。

首先为 NSTimer 提供一个属性，以便您可以使其失效，以便稍后停止。

@property (nonatomic, strong) NSTimer *blinkTimer.

下面是如何在代码中创建计时器的示例：

self.blinkTimer = [NSTimer scheduledTimerWithTimeInterval:0.3 target:self selector:@selector(timerUpdate) userInfo:nil repeats:YES];

这将每 0.3 秒调用一次 timerUpdate。

在计时器更新中，您可以打开/关闭手电筒。

当你希望它停止时，只需执行[self.blinkTimer invalidate];