要打滑View参加UIPanGestureRecognizer
#pragma mark 手势识别器回调方法
- (void)dragView:(UIPanGestureRecognizer *)gesture{
switch (gesture.state) {
case UIGestureRecognizerStateBegan:
[self startDrag];
break;
case UIGestureRecognizerStateEnded:
[self endDrag];
break;
default:
[self Draging:gesture];
break;
}
}
#pragma mark 開始拖动,记录下開始的x值
- (void)startDrag{
CGRect frame = _mainView.frame;
_lastDownX = frame.origin.x;
}
#pragma mark 正在拖动,让View跟着动
- (void)Draging:(UIPanGestureRecognizer *)gesture{
CGFloat maxX = [UIScreen mainScreen].bounds.size.width * kSlideRatio;
CGPoint transform = [gesture translationInView:_mainView];
CGRect frame = _mainView.frame;
frame.origin.x = _lastDownX + transform.x;
if (frame.origin.x < 0) { //不能够移动到屏幕左边去
frame.origin.x = 0;
}else if(frame.origin.x > maxX){
frame.origin.x = maxX; //限制移动的最右边
}
_mainView.frame = frame;
// 设置界面scale动画
CGFloat tx = frame.origin.x;
if (tx < 0) {
tx = 0;
}
CGFloat txScale = tx / _settingsViewController.view.frame.size.width;
// 让imageview缩放
double scale = kDefaultSettingScale + txScale * (1 - kDefaultSettingScale);
if (scale > 1){
scale = 1;
}
CGAffineTransform cgTransform = CGAffineTransformMakeScale(scale, scale);
[_settingsViewController setAnimationScale:cgTransform];
}
#pragma mark 拖动结束,推断要往哪边滚动
- (void)endDrag{
int maxX = [self getSettingRight];
int currentX = _mainView.frame.origin.x;
if (currentX < maxX * 0.5) { //没到一半,回到左边
currentX = 0;
}else{ //回到右边
currentX = maxX;
}
CGRect frame = _mainView.frame;
frame.origin.x = currentX;
[self scrollMainViewToFrame:frame withDuration:0.25];
}
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