如何确定我的iOS设备是否装有手电筒? [英] How can I determine whether my iOS device has a torch light?

问题描述

在我的应用程序中，我可以选择使用手电筒.但是，只有iPhone 4和iPhone 4S带有手电筒.其他设备没有手电筒.如何找到当前的设备型号?请帮我.预先感谢.

In my application I have the option for a torch light. Howevver, only iPhone 4 and iPhone 4S have torch lights. Other devices do not have the torch light. How can I find the current device model? Please help me. Thanks in advance.

推荐答案

您不应使用设备模型作为功能是否存在的指示.而是使用可以准确告诉您该功能是否存在的API.

You should not use the device model as an indicator of whether a feature is present. Instead, use the API that tells you exactly if the feature is present.

您要使用AVCaptureDevice的-hasTorch属性:

NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
NSMutableArray *torchDevices = [[NSMutableArray alloc] init];
BOOL hasTorch = NO;

for (AVCaptureDevice *device in devices) {
    if ([device hasTorch]) {
        [torchDevices addObject:device];
    }
}

hasTorch = ([torchDevices count] > 0);

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