FMSimpleBlockAnimation

gistfile1.txt

#import <Cocoa/Cocoa.h>

@interface FMSimpleBlockAnimation : NSAnimation {
    void (^_animationBlock)(float t);
}

- (void)animateWithBlock:(void(^)(float t))block;

@end



#import "FMSimpleBlockAnimation.h"

@implementation FMSimpleBlockAnimation

- (void)animateWithBlock:(void(^)(float t))block {
    _animationBlock = [block copy];
    [self startAnimation];
}

- (void)setCurrentProgress:(NSAnimationProgress)progress {
    if (_animationBlock) {
        _animationBlock(progress);
    }
}

@end

FMSimpleBlockAnimation *a = [[FMSimpleBlockAnimation alloc] initWithDuration:.25 animationCurve:NSAnimationEaseIn];

[a setFrameRate:60];
[a setAnimationBlockingMode:NSAnimationNonblocking];
[a animateWithBlock:^(float t) {
    _fadeInOpacity = t;
    [self setNeedsDisplay:YES];
}];