一、解决方案
iPhone14 Pro/Pro Max的主摄焦距更长。在近距离拍摄时无法对焦。只需要判断机型然后更换焦距更短的摄像头即可。该摄像头与主摄相比，同样的距离会拍摄到更多的内容，此时可以通过调整摄像头的缩放来达到与主摄一样的效果（下面代码没有缩放）。
#import <sys/utsname.h>
#import <sys/stat.h>
- (AVCaptureDevice *)captureDeviceWithPosition:(AVCaptureDevicePosition)position {
if ([UIDevice currentDevice].systemVersion.floatValue >= 10.0) {
AVCaptureDeviceType deviceType = AVCaptureDeviceTypeBuiltInWideAngleCamera;
if (position == AVCaptureDevicePositionBack) {
struct utsname systemInfo;
uname(&systemInfo);
NSString *deviceModel = [NSString stringWithCString:systemInfo.machine encoding:NSUTF8StringEncoding];
if ([deviceModel isEqualToString:@"iPhone15,2"] ||
[deviceModel isEqualToString:@"iPhone15,3"]) {
if ([UIDevice currentDevice].systemVersion.floatValue >= 13.0) {
deviceType = AVCaptureDeviceTypeBuiltInUltraWideCamera;
}
}
}
AVCaptureDeviceDiscoverySession *devicesIOS10 = [AVCaptureDeviceDiscoverySession discoverySessionWithDeviceTypes:@[deviceType] mediaType:AVMediaTypeVideo position:position];
NSArray *devicesIOS = devicesIOS10.devices;
for (AVCaptureDevice *device in devicesIOS) {
if ([device position] == position) {
return device;
}
}
return nil;
} else {
NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
//遍历这些设备返回跟position相关的设备
for (AVCaptureDevice *device in devices) {
if ([device position] == position) {
return device;
}
}
return nil;
}
}
二、AVCaptureDeviceType介绍
1、AVCaptureDeviceType
| 类型 |
介绍 |
| AVCaptureDeviceTypeBuiltInMichrophone |
麦克风设备 |
| AVCaptureDeviceTypeBuiltInWideAngleCamera |
内置广角相机设备 |
| AVCaptureDeviceTypeBuiltInTelephotoCamera |
内置的相机设备 焦距比广角相机长。注意: 此类设备只能使用 AVCaptureDeviceDiscoverySession 发现 |
| AVCaptureDeviceTypeBuiltInUltraWideCamera |
比广角相机焦距短的内置相机设备。注意: 此类设备只能使用 AVCaptureDeviceDiscoverySession 发现 |
| AVCaptureDeviceTypeBuiltInDualCamera |
一种由两个固定的焦距照相机组成的设备。一个是广角镜头(Wide)，一个是远摄镜头 （Telephoto） |
| AVCaptureDeviceTypeBuiltInDualWideCamera |
一种由两个固定焦距照相机组成的设备。一个是超宽镜头（Ultra Wide)，一个是广角镜头（Wide Angle） |
| AVCaptureDeviceTypeBuiltInTripleCamera |
一种由三个固定焦距照相机组成的设备。一个超宽镜头（Ultra Wide），一个广角镜头（Wide Angle）和一个远摄镜头（Telephoto）组成 |
| AVCaptureDeviceTypeBuiltInTrueDepthCamera |
一种由两台摄像机组成的设备。一台 YUV 和一台红外线。红外线摄像头可提供高质的深度信息，该信息可与 YUV 摄像头产生的帧同步并进行透视纠正。两台摄像头的分辨率可能不通透，但他们的相同的纵横比 |
2、对焦
| 类型 |
|
| AVCaptureDeviceTypeBuiltInWideAngleCamera |
iPhone14 Pro/Pro Max后摄不能近距离对焦 |
| AVCaptureDeviceTypeBuiltInUltraWideCamera |
iPhone14 Pro/Pro Max后摄可近距离对焦 |
| AVCaptureDeviceTypeBuiltInDualWideCamera |
iPhone14 Pro/Pro Max后摄可近距离对焦 |
| AVCaptureDeviceTypeBuiltInTripleCamera |
iPhone14 Pro/Pro Max后摄可近距离对焦 该类型只有iPhone14 Pro/Max能获取到 |
查看当前设备可用的摄像头
AVCaptureDeviceDiscoverySession *discoverySession = [AVCaptureDeviceDiscoverySession
discoverySessionWithDeviceTypes:@[AVCaptureDeviceTypeBuiltInWideAngleCamera,AVCaptureDeviceTypeBuiltInTelephotoCamera,AVCaptureDeviceTypeBuiltInUltraWideCamera,AVCaptureDeviceTypeBuiltInDualCamera,AVCaptureDeviceTypeBuiltInDualWideCamera,AVCaptureDeviceTypeBuiltInTripleCamera,AVCaptureDeviceTypeBuiltInTrueDepthCamera]
mediaType:AVMediaTypeVideo;
position:AVCaptureDevicePositionUnspecified];
NSArray<AVCaptureDevice *> *videoDevices = discoverySession.devices;
for (AVCaptureDevice *device in videoDevices) {
NSLog(@"Device name: %@", device.localizedName);
NSLog(@"Device ID: %@", device.uniqueID);
NSLog(@"Position: %@", device.position == AVCaptureDevicePositionBack ? @"Back" : @"Front");
NSLog(@"-----------------------------------");
}
iPhone13可用设备：
(
"<AVCaptureFigVideoDevice: 0x10508d000 [Back Camera][com.apple.avfoundation.avcapturedevice.built-in_video:0]>",
"<AVCaptureFigVideoDevice: 0x105015200 [Back Ultra Wide Camera][com.apple.avfoundation.avcapturedevice.built-in_video:5]>",
"<AVCaptureFigVideoDevice: 0x10508d600 [Back Dual Wide Camera][com.apple.avfoundation.avcapturedevice.built-in_video:6]>"
)
iPhone14 Pro/Pro Max可用设备：
(
"<AVCaptureFigVideoDevice: 0x11706f200 [Back Camera][com.apple.avfoundation.avcapturedevice.built-in_video:0]>",
"<AVCaptureFigVideoDevice: 0x11706f800 [Back Telephoto Camera][com.apple.avfoundation.avcapturedevice.built-in_video:2]>",
"<AVCaptureFigVideoDevice: 0x117075200 [Back Ultra Wide Camera][com.apple.avfoundation.avcapturedevice.built-in_video:5]>",
"<AVCaptureFigVideoDevice: 0x117075800 [Back Dual Camera][com.apple.avfoundation.avcapturedevice.built-in_video:3]>",
"<AVCaptureFigVideoDevice: 0x117077000 [Back Dual Wide Camera][com.apple.avfoundation.avcapturedevice.built-in_video:6]>",
"<AVCaptureFigVideoDevice: 0x117077600 [Back Triple Camera][com.apple.avfoundation.avcapturedevice.built-in_video:7]>",
"<AVCaptureFigVideoDevice: 0x11707d000 [Back LiDAR Depth Camera][com.apple.avfoundation.avcapturedevice.built-in_video:9]>"
)
