在一些应用中,我们需要用到ios设备的摄像头进行拍照,视频。并且从相册中选取我们需要的图片或者视频。
关于ios摄像头和相册的应用,可以使用uiimagepickercontroller类来完成控制。
uiimagepickercontroller 这个类可以为大家提供照相的功能,以及图片,视频浏览的功能。
检查硬件是否安装有摄像头或者允许操作相册
// 判断设备是否有摄像头
- (bool) iscameraavailable{
return [uiimagepickercontroller issourcetypeavailable:uiimagepickercontrollersourcetypecamera];
}
// 前面的摄像头是否可用
- (bool) isfrontcameraavailable{
return [uiimagepickercontrolleriscameradeviceavailable:uiimagepickercontrollercameradevicefront];
}
// 后面的摄像头是否可用
- (bool) isrearcameraavailable{
return [uiimagepickercontrolleriscameradeviceavailable:uiimagepickercontrollercameradevicerear];
}
调用摄像头
- (avcapturedevice *)camerawithposition : (avcapturedeviceposition) position
{
nsarray *devices = [avcapturedevice deviceswithmediatype:avmediatypevideo];
for (avcapturedevice *device in devices )
if ( device.position == position )
return device;
return nil ;
}
- (void) swapfrontandbackcameras {
//check for available cameras!
if (![self hasmultiplecameras]) return;
//assumes session is running
nsarray *inputs = self.capturesession.inputs; //should only be one value!
for ( avcapturedeviceinput *capturedeviceinput in inputs ) {
avcapturedevice *device = capturedeviceinput.device ;
if ( [device hasmediatype:avmediatypevideo ] ) {
avcapturedeviceposition position = device.position ;
avcapturedevice *newcamera = nil ;
avcapturedeviceinput *newinput = nil ;
if (position == avcapturedevicepositionfront)
newcamera = [self camerawithposition:avcapturedevicepositionback];
else
newcamera = [self camerawithposition:avcapturedevicepositionfront];
[self initializecapturedevice:newcamera];
newinput = [avcapturedeviceinput deviceinputwithdevice:newcamera error:nil];
// beginconfiguration ensures that pending changes are not applied immediately
[self.capturesession beginconfiguration ];
[self.capturesession removeinput:capturedeviceinput]; //remove current
[self.capturesession addinput:newinput]; //add new
// changes take effect once the outermost commitconfiguration is invoked.
[self.capturesession commitconfiguration];
break ;
}
}
}
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