Objective-C中 切换前后置摄像头
时间: 2024-02-21 08:57:43 浏览: 21
left: 50%;
transform: translateX(-50%);
width: 1px;
z-index: -1;
}
</style>
</head>
<body>
<div class="container">
<a href="#" class="back"><i class="在Objective-C中,可以通过AVCaptureSession来实现前后置摄像头的切换。具体步骤如下fa fa-arrow-left"></i></a>
<h1>登陆</h1>
<form action="" method="post">
:
1. 创建AVCaptureSession对象:
```
AVCaptureSession *session = [[AVCaptureSession alloc] init];
```
2 <label for="username">用户名</label>
<input type="text" id="username" name="username" required>
. 获取设备:
```
AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
```
3 <label for="password">密码</label>
<input type="password" id="password" name="password" required>
. 创建输入对象:
```
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];
`` <input type="submit" value="登陆">
<div class="social-login">
<p>或使用以下社交`
4. 将输入对象添加到session中:
```
if ([session canAddInput:input]) {
[session addInput:账号登陆</p>
<ul>
<li><a href="#" class="facebook"><i class="fa fa-facebook"></input];
}
```
5. 创建输出对象:
```
AVCaptureVideoDataOutput *output = [[AVCaptureVideoDataOutput alloc]i></a></li>
<li><a href="#" class="twitter"><i class="fa fa-twitter"></i></a></li init];
```
6. 将输出对象添加到session中:
```
if ([session canAddOutput:output]) {
[session>
<li><a href="#" class="google"><i class="fa fa-google"></i></a></li>
</ul addOutput:output];
}
```
7. 获取所有可用设备,并找到前置/后置摄像头:
``>
</div>
</form>
</div>
</body>
</html>
```
这个页面使用了一`
NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
AVCaptureDevice *backCamera = nil;
AVCaptureDevice些新的 CSS 属性和选择器,如 `:focus` 伪类、`transition` 属性、`transform` 属性等, *frontCamera = nil;
for (AVCaptureDevice *device in devices) {
if ([device position] == AVCaptureDevicePositionBack)使得页面元素在交互和视觉效果方面更加丰富和流畅。此外,也使用了 {
backCamera = device;
}
else if ([device position] == AVCaptureDevicePositionFront) {
frontCamera = device;
一些外部 CSS 库,如 Font Awesome 和 Normalize.css,使得页面的样式更加统一和规范。