利用手勢操作實現抽屜效果：

第一步：搭建UI

(void)addChildView
{
// left
UIView *leftView = [[UIView alloc] initWithFrame:self.view.bounds];
leftView.backgroundColor = [UIColor greenColor];
[self.view addSubview:leftView];
_leftView = leftView;

// right UIView *rightView = [[UIView alloc] initWithFrame:self.view.bounds]; rightView.backgroundColor = [UIColor blueColor]; [self.view addSubview:rightView]; _rightView = rightView;// mainView UIView *mainView = [[UIView alloc] initWithFrame:self.view.bounds]; mainView.backgroundColor = [UIColor redColor]; [self.view addSubview:mainView]; _mainView = mainView;

}

第二步：獲取手勢操作對象，獲取手勢移動大小
- (void)touchesMoved:(NSSet )touches withEvent:(UIEvent )event
{
// 獲取UITouch對象
UITouch *touch = [touches anyObject];

// 獲取當前點 CGPoint currentPoint = [touch locationInView:self.view];// 獲取上一個點 CGPoint prePoint = [touch previousLocationInView:self.view];// x軸偏移量：當手指移動一點的時候，x偏移多少 CGFloat offsetX = currentPoint.x - prePoint.x;// 設置當前主視圖的frame _mainView.frame = [self getCurrentFrameWithOffsetX:offsetX];_isDraging = YES;

}
第三步：利用手勢平移量來重寫計算新的frame
//#define HMMaxY 60
// 當手指偏移一點，根據X軸的偏移量算出當前主視圖的frame
- (CGRect)getCurrentFrameWithOffsetX:(CGFloat)offsetX
{
CGFloat screenW = [UIScreen mainScreen].bounds.size.width;
CGFloat screenH = [UIScreen mainScreen].bounds.size.height;

// 獲取y軸偏移量，手指每移動一點，y軸偏移多少 CGFloat offsetY = offsetX * HMMaxY / screenW;CGFloat scale = (screenH - 2 * offsetY) / screenH;if (_mainView.frame.origin.x < 0) { // 往左邊滑動scale = (screenH + 2 * offsetY) / screenH; }// 獲取之前的frame CGRect frame = _mainView.frame; frame.origin.x += offsetX; frame.size.height = frame.size.height *scale; frame.size.width = frame.size.width *scale; frame.origin.y = (screenH - frame.size.height) * 0.5;return frame;

}

第四步：定位于復位業務邏輯
//#define HMRTarget 250
//#define HMLTarget -220
/*
_mainView.frame.origin.x > screenW * 0.5 定位到右邊
CGRectGetMaxX(_mainView.frame) < screenW * 0.5 定位到左邊 -220

*/
// 定位
- (void)touchesEnded:(NSSet )touches withEvent:(UIEvent )event
{

// 復位 if (_isDraging == NO && _mainView.frame.origin.x != 0) {[UIView animateWithDuration:0.25 animations:^{_mainView.frame = self.view.bounds;}]; }CGFloat screenW = [UIScreen mainScreen].bounds.size.width;CGFloat target = 0; if (_mainView.frame.origin.x > screenW * 0.5) { // 定位到右邊target = HMRTarget; }else if (CGRectGetMaxX(_mainView.frame) < screenW * 0.5) { // 定位到左邊target = HMLTarget; }[UIView animateWithDuration:0.25 animations:^{if (target) { // 在需要定位左邊或者右邊// 獲取x軸偏移量CGFloat offsetX = target - _mainView.frame.origin.x;// 設置當前主視圖的frame_mainView.frame = [self getCurrentFrameWithOffsetX:offsetX];}else{ // 還原_mainView.frame = self.view.bounds;} }];_isDraging = NO;

}

總結

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