72 lines
2.0 KiB
Objective-C
72 lines
2.0 KiB
Objective-C
//
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// SCCaptureDeviceAuthorizationChecker.m
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// Snapchat
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//
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// Created by Sun Lei on 15/03/2018.
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//
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#import "SCCaptureDeviceAuthorizationChecker.h"
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#import <SCFoundation/SCQueuePerformer.h>
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#import <SCFoundation/SCTraceODPCompatible.h>
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@import AVFoundation;
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@interface SCCaptureDeviceAuthorizationChecker () {
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SCQueuePerformer *_performer;
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BOOL _videoCaptureAuthorizationCachedValue;
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}
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@end
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@implementation SCCaptureDeviceAuthorizationChecker
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- (instancetype)initWithPerformer:(SCQueuePerformer *)performer
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{
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SCTraceODPCompatibleStart(2);
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self = [super init];
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if (self) {
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_performer = performer;
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_videoCaptureAuthorizationCachedValue = NO;
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}
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return self;
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}
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- (void)preloadVideoCaptureAuthorization
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{
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SCTraceODPCompatibleStart(2);
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[_performer perform:^{
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SCTraceODPCompatibleStart(2);
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_videoCaptureAuthorizationCachedValue = [self authorizedForMediaType:AVMediaTypeVideo];
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}];
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}
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- (BOOL)authorizedForVideoCapture
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{
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SCTraceODPCompatibleStart(2);
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// Cache authorizedForVideoCapture for low devices if it's YES
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// [AVCaptureDevice authorizationStatusForMediaType:] is expensive on low devices like iPhone4
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if (_videoCaptureAuthorizationCachedValue) {
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// If the user authorizes and then unauthorizes, iOS would SIGKILL the app.
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// When the user opens the app, a pop-up tells the user to allow camera access in settings.
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// So 'return YES' makes sense here.
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return YES;
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} else {
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@weakify(self);
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[_performer performAndWait:^{
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@strongify(self);
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SC_GUARD_ELSE_RETURN(self);
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if (!_videoCaptureAuthorizationCachedValue) {
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_videoCaptureAuthorizationCachedValue = [self authorizedForMediaType:AVMediaTypeVideo];
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}
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}];
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return _videoCaptureAuthorizationCachedValue;
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}
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}
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- (BOOL)authorizedForMediaType:(NSString *)mediaType
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{
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return [AVCaptureDevice authorizationStatusForMediaType:mediaType] == AVAuthorizationStatusAuthorized;
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}
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@end
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