QQ去除未读状态的动画
by 伍雪颖
- (void)drawRect:(CGRect)rect
{
switch (_state) {
case
SRSlimeStateNormal:
{
float percent =
1 -
distansBetween(_startPoint ,
_toPoint) /
_viscous;
if (percent ==
1) {
CGContextRef context =
UIGraphicsGetCurrentContext();
UIBezierPath *path = [UIBezierPath
bezierPathWithRoundedRect:CGRectMake(_startPoint.x
- _radius,
_startPoint.y -
_radius,
2*_radius,
2*_radius)
cornerRadius:_radius];
[self
setContext:context
path:path];
CGContextDrawPath(context,
kCGPathFillStroke);
}else {
CGFloat startRadius =
_radius * (kStartTo + (1-kStartTo)*percent);
CGFloat endRadius =
_radius * (kEndTo + (1-kEndTo)*percent);
CGContextRef context =
UIGraphicsGetCurrentContext();
UIBezierPath *path = [self
bodyPath:startRadius
end:endRadius
percent:percent];
[self
setContext:context
path:path];
CGContextDrawPath(context,
kCGPathFillStroke);
if (percent <=
0) {
_state =
SRSlimeStateShortening;
[self
scaling];
}
}
}
break;
case
SRSlimeStateShortening:
{
_toPoint =
CGPointMake((_toPoint.x
- _startPoint.x)*0.8
+ _startPoint.x,
(_toPoint.y -
_startPoint.y)*0.8
+ _startPoint.y);
float p =
distansBetween(_startPoint,
_toPoint) /
_viscous;
float percent =1 -p;
float r =
_radius * p;
if (p >
0.01) {
CGFloat startRadius = r * (kStartTo + (1-kStartTo)*percent);
CGContextRef context =
UIGraphicsGetCurrentContext();
CGFloat endRadius = r * (kEndTo + (1-kEndTo)*percent)
* (1+percent /
2);
UIBezierPath *path = [self
bodyPath:startRadius
end:endRadius
percent:percent];
[self
setContext:context
path:path];
CGContextDrawPath(context,
kCGPathFillStroke);
}else {
self.hidden =
YES;
_state =
SRSlimeStateMiss;
}
}
break;
default:
break;
}
}