前段时间总监有个需求让我实现，就是可伸缩的UIButton
比如:
伸缩UIButton
这个很简单没有什么好说的。
主要做法就是计算好view的宽和Button的X.
做完之后总监不满意，认为既然可以伸缩，那么就应该也可以拖动！
好了，又要费点事儿了。
所以我们给UIButton 添加一个扩展，在扩展文件里，我们重写UIResponder的方法。
- (void)touchesBegan:(NSSet)touches withEvent:(UIEvent)event;**
- (void)touchesMoved:(NSSet)touches withEvent:(UIEvent)event;**
-(void)touchesEnded:(NSSet)touches withEvent:(UIEvent)event;**
我们分别要重写这三个方法，具体三个方法的实现：
touchesBegan:
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
[super touchesBegan:touches withEvent:event];
self.highlighted = YES;
if (![objc_getAssociatedObject(self, DragEnableKey) boolValue]) {
return;
}
begincenter=self.superview.center;
UITouch *touch = [touches anyObject];
beginPoint = [touch locationInView:self.superview];
}
touchesMoved:
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
self.highlighted = NO;
[super touchesMoved:touches withEvent:event];
if (![objc_getAssociatedObject(self, DragEnableKey) boolValue]) {
return;
}
UITouch *touch = [touches anyObject];
CGPoint nowPoint = [touch locationInView:self];
float offsetX = nowPoint.x - beginPoint.x;
float offsetY = nowPoint.y - beginPoint.y;
self.superview.center = CGPointMake(self.superview.center.x + offsetX, self.superview.center.y + offsetY);
}
touchesEnded:
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
if (self.superview && [objc_getAssociatedObject(self,AdsorbEnableKey) boolValue] ) {
if (self.highlighted) {
[self sendActionsForControlEvents:UIControlEventTouchDown];
self.highlighted = NO;
}
CGPoint nowPoint = self.superview.center;
float offsetX = nowPoint.x - begincenter.x;
float offsetY = nowPoint.y - begincenter.y;
if (fabsf(offsetX)<5 && fabsf(offsetY)<5) {
[super touchesEnded:touches withEvent:event];
}
float marginLeft = self.superview.frame.origin.x;
float marginRight = self.superview.superview.frame.size.width - self.superview.frame.origin.x - self.superview.frame.size.width;
float marginTop = self.superview.frame.origin.y;
float marginBottom = self.superview.superview.frame.size.height - self.superview.frame.origin.y - self.superview.frame.size.height;
[UIView animateWithDuration:0.125 animations:^(void){
if (marginTop<60) {
self.superview.frame = CGRectMake(marginLeft<marginRight?marginLeft<PADDING?PADDING:self.superview.frame.origin.x:marginRight<PADDING?self.superview.superview.frame.size.width -self.superview.frame.size.width-PADDING:self.superview.frame.origin.x,
PADDING,
self.superview.frame.size.width,
self.superview.frame.size.height);
}
else if (marginBottom<60) {
self.superview.frame = CGRectMake(marginLeft<marginRight?marginLeft<PADDING?PADDING:self.superview.frame.origin.x:marginRight<PADDING?self.superview.superview.frame.size.width -self.superview.frame.size.width-PADDING:self.superview.frame.origin.x,
self.superview.superview.frame.size.height - self.superview.frame.size.height-PADDING,
self.superview.frame.size.width,
self.superview.frame.size.height);
}
else {
self.superview.frame = CGRectMake(marginLeft<marginRight?PADDING:self.superview.superview.frame.size.width - self.superview.frame.size.width-PADDING,
self.superview.frame.origin.y,
self.superview.frame.size.width,
self.superview.frame.size.height);
}
}];
}else{
[super touchesEnded:touches withEvent:event];
}
}
最后要实现的效果大概就是这样。
最后附上gitHub链接，希望能给有同样需求的你们带来帮助。
