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#import "MWMAnimator.h"
#import <objc/runtime.h>
@interface MWMAnimator ()
@property (nonatomic) CADisplayLink * displayLink;
@property (nonatomic) NSMutableSet * animations;
@end
@implementation MWMAnimator
+ (instancetype)animatorWithScreen:(UIScreen *)screen
{
if (!screen)
screen = [UIScreen mainScreen];
MWMAnimator * animator = objc_getAssociatedObject(screen, _cmd);
if (!animator)
{
animator = [[self alloc] initWithScreen:screen];
objc_setAssociatedObject(screen, _cmd, animator, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
return animator;
}
- (instancetype)initWithScreen:(UIScreen *)screen
{
self = [super init];
if (self)
{
self.displayLink = [screen displayLinkWithTarget:self selector:@selector(animationTick:)];
self.displayLink.paused = YES;
[self.displayLink addToRunLoop:[NSRunLoop mainRunLoop] forMode:NSRunLoopCommonModes];
self.animations = [NSMutableSet set];
}
return self;
}
- (void)animationTick:(CADisplayLink *)displayLink
{
CFTimeInterval const dt = displayLink.duration;
for (id<Animation> a in self.animations.copy)
{
BOOL finished = NO;
[a animationTick:dt finished:&finished];
if (finished)
[self.animations removeObject:a];
}
if (self.animations.count == 0)
self.displayLink.paused = YES;
}
- (void)addAnimation:(id<Animation>)animation
{
[self.animations addObject:animation];
if (self.animations.count == 1)
self.displayLink.paused = NO;
}
- (void)removeAnimation:(id <Animation>)animatable
{
if (animatable == nil)
return;
[self.animations removeObject:animatable];
if (self.animations.count == 0)
self.displayLink.paused = YES;
}
@end
@implementation UIView (AnimatorAdditions)
- (MWMAnimator *)animator
{
return [MWMAnimator animatorWithScreen:self.window.screen];
}
@end
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