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September 7, 2022 02:45
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A ticker class that uses CADisplayLink
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| // | |
| // UPTicker.h | |
| // Copyright © 2020-2022 Ken Kocienda. All rights reserved. | |
| // | |
| // Permission is hereby granted, free of charge, to any person obtaining a | |
| // copy of this software and associated documentation files (the | |
| // "Software"), to deal in the Software without restriction, including | |
| // without limitation the rights to use, copy, modify, merge, publish, | |
| // distribute, sublicense, and/or sell copies of the Software, and to | |
| // permit persons to whom the Software is furnished to do so, subject to | |
| // the following conditions: | |
| // | |
| // The above copyright notice and this permission notice shall be included | |
| // in all copies or substantial portions of the Software. | |
| // | |
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
| // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
| // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. | |
| // IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY | |
| // CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, | |
| // TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE | |
| // SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | |
| #import <Foundation/Foundation.h> | |
| #import <QuartzCore/QuartzCore.h> | |
| @class UPTickingAnimator; | |
| @protocol UPTicking; | |
| extern CFTimeInterval UPTickerInterval; | |
| @interface UPTicker : NSObject | |
| + (UPTicker *)instance; | |
| - (instancetype)init NS_UNAVAILABLE; | |
| - (void)addTicking:(NSObject<UPTicking> *)ticking; | |
| - (void)removeTicking:(NSObject<UPTicking> *)ticking; | |
| - (void)removeAllTickings; | |
| - (void)start; | |
| - (void)stop; | |
| @end | |
| @protocol UPTicking <NSObject> | |
| @property (nonatomic, readonly) uint32_t serialNumber; | |
| - (void)tick:(CFTimeInterval)now; | |
| @end |
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| // | |
| // UPTicker.m | |
| // Copyright © 2020-2022 Ken Kocienda. All rights reserved. | |
| // | |
| // Permission is hereby granted, free of charge, to any person obtaining a | |
| // copy of this software and associated documentation files (the | |
| // "Software"), to deal in the Software without restriction, including | |
| // without limitation the rights to use, copy, modify, merge, publish, | |
| // distribute, sublicense, and/or sell copies of the Software, and to | |
| // permit persons to whom the Software is furnished to do so, subject to | |
| // the following conditions: | |
| // | |
| // The above copyright notice and this permission notice shall be included | |
| // in all copies or substantial portions of the Software. | |
| // | |
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
| // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
| // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. | |
| // IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY | |
| // CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, | |
| // TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE | |
| // SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | |
| #import <UIKit/UIScreen.h> | |
| #import "UPAssertions.h" | |
| #import "UPMacros.h" | |
| #import "UPTicker.h" | |
| CFTimeInterval UPTickerInterval = 1.0 / 60.0; | |
| @interface UPTicker () | |
| @property (nonatomic) NSMutableSet<NSObject<UPTicking> *> *tickings; | |
| @property (nonatomic) NSMutableArray<NSObject<UPTicking> *> *iterationTickings; | |
| @property (nonatomic) CADisplayLink *displayLink; | |
| @end | |
| @implementation UPTicker | |
| + (UPTicker *)instance | |
| { | |
| static dispatch_once_t onceToken; | |
| static UPTicker *instance; | |
| dispatch_once(&onceToken, ^{ | |
| instance = [[self alloc] _init]; | |
| }); | |
| return instance; | |
| } | |
| - (instancetype)_init | |
| { | |
| self = [super init]; | |
| self.tickings = [NSMutableSet set]; | |
| self.iterationTickings = [NSMutableArray array]; | |
| return self; | |
| } | |
| - (void)addTicking:(NSObject<UPTicking> *)ticking | |
| { | |
| [self.tickings addObject:ticking]; | |
| [self _startDisplayLinkIfNeeded]; | |
| } | |
| - (void)removeTicking:(NSObject<UPTicking> *)ticking | |
| { | |
| [self.tickings removeObject:ticking]; | |
| [self _stopDisplayLinkIfNoTickings]; | |
| } | |
| - (void)removeAllTickings | |
| { | |
| [self.tickings removeAllObjects]; | |
| [self stop]; | |
| } | |
| - (void)start | |
| { | |
| [self _startDisplayLinkIfNeeded]; | |
| } | |
| - (void)stop | |
| { | |
| [self.displayLink invalidate]; | |
| self.displayLink = nil; | |
| } | |
| static BOOL tickIntervalChecked = NO; | |
| - (void)_tick:(CADisplayLink *)sender | |
| { | |
| if (UNLIKELY(!tickIntervalChecked)) { | |
| tickIntervalChecked = YES; | |
| UPTickerInterval = self.displayLink.duration; | |
| } | |
| CFTimeInterval now = CACurrentMediaTime(); | |
| [self.iterationTickings removeAllObjects]; | |
| for (NSObject<UPTicking> *ticking in self.tickings) { | |
| [self.iterationTickings addObject:ticking]; | |
| } | |
| if (self.iterationTickings.count > 1) { | |
| [self.iterationTickings sortUsingComparator: | |
| ^NSComparisonResult(id obj1, id obj2) { | |
| NSObject<UPTicking> *t1 = obj1; | |
| NSObject<UPTicking> *t2 = obj2; | |
| if (t1.serialNumber < t2.serialNumber) { | |
| return NSOrderedAscending; | |
| } | |
| if (t1.serialNumber > t2.serialNumber) { | |
| return NSOrderedDescending; | |
| } | |
| return NSOrderedSame; | |
| }]; | |
| } | |
| for (NSObject<UPTicking> *ticking in self.iterationTickings) { | |
| [ticking tick:now]; | |
| } | |
| } | |
| - (void)_startDisplayLinkIfNeeded | |
| { | |
| if (self.tickings.count == 0) { | |
| return; | |
| } | |
| if (!self.displayLink) { | |
| tickIntervalChecked = NO; | |
| self.displayLink = [[UIScreen mainScreen] displayLinkWithTarget:self selector:@selector(_tick:)]; | |
| [self.displayLink addToRunLoop:[NSRunLoop mainRunLoop] forMode:NSRunLoopCommonModes]; | |
| } | |
| } | |
| - (void)_stopDisplayLinkIfNoTickings | |
| { | |
| if (self.tickings.count == 0) { | |
| [self stop]; | |
| } | |
| } | |
| @end |
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