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我有代碼來繪製矩形作爲如何不間斷的改變矩形的高度在iOS應用
- (void)drawRect:(CGRect)frame {
UIBezierPath* rectanglePath = [UIBezierPath
bezierPathWithRect:CGRectMake(67, 50, 2, _height)];
[UIColor.grayColor setFill];
[rectanglePath fill];
}
其中_height值將在點擊不斷變化
我有這樣
代碼- (void)initialize {
self.userInteractionEnabled = YES;
_displayLink = [CADisplayLink displayLinkWithTarget:self
selector:@selector(redrawView:)];
[_displayLink addToRunLoop:[NSRunLoop mainRunLoop]forMode:NSDefaultRunLoopMode];
NSMutableArray *array = [[NSMutableArray alloc]init];
[array addObjectsFromArray:@[@「10」,@「20」,@「30」,@「40」]];
}
- (void)dealloc {
[_displayLink invalidate];
[_displayLink removeFromRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode];
_displayLink = nil;
}
- (void)setInteractionState:(InteractionState)interactionState {
if (_interactionState == Idle && interactionState != Idle) {
_displayLink.paused = NO;
}
_interactionState = interactionState;
}
- (void)redrawView:(CADisplayLink *)displayLink {
if (_interactionState == start) {
_height = [array firstObject];
[array removeObjectAtIndex:0];
[array addObject:_height];
}
}
無論何時只要互動狀態正在播放,如何改變高度?