마스크를 사용하여 이미지의 일부를 선택하는 방법을 보여 준 샘플을 작성했습니다. 더 복잡한 효과를 구현하려면 경로를 변경해야하며 원하는 모양을 얻을 수 있습니다.
@interface MainViewController()
@property UIImageView* imageV;
@property UIView* selectView;
@property UIView *blockView;
@property CGPoint startPoint;
@property CGPoint endPoint;
@end
@implementation MainViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
UIBarButtonItem *recoverItem = [[UIBarButtonItem alloc] initWithTitle:@"Recover" style:UIBarButtonItemStyleDone target:self action:@selector(recover)];
[self.navigationItem setLeftBarButtonItem:recoverItem];
_imageV = [[UIImageView alloc] initWithFrame:[UIScreen mainScreen].bounds];
_imageV.image = [UIImage imageNamed:@"test"];
[self.view addSubview:_imageV];
_blockView = [[UIView alloc] init];
_blockView.frame = _imageV.bounds;
_blockView.backgroundColor = [UIColor whiteColor];
[_imageV addSubview:_blockView];
_blockView.hidden = true;
_selectView = [[UIView alloc] init];
_selectView.layer.borderColor = [UIColor greenColor].CGColor;
_selectView.layer.borderWidth = 2;
[_imageV addSubview:_selectView];
_selectView.hidden = true;
UIPanGestureRecognizer *panGR = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePan:)];
[self.view addGestureRecognizer:panGR];
}
- (void) handlePan: (UIPanGestureRecognizer *)pan{
if (UIGestureRecognizerStateBegan == pan.state) {
_startPoint = [pan locationInView:_imageV];
}
else if (UIGestureRecognizerStateChanged == pan.state) {
_selectView.hidden = false;
CGPoint currentP = [pan locationInView:_imageV];
float rectWidth = currentP.x - _startPoint.x;
float rectHeight = currentP.y - _startPoint.y;
_selectView.frame = CGRectMake(_startPoint.x, _startPoint.y, rectWidth,rectHeight);
}
else if (UIGestureRecognizerStateEnded == pan.state) {
_endPoint = [pan locationInView:_imageV];
float rectWidth = _endPoint.x - _startPoint.x;
float rectHeight = _endPoint.y - _startPoint.y;
//create path
UIBezierPath *maskPath = [UIBezierPath bezierPathWithRect:[UIScreen mainScreen].bounds];
UIBezierPath *otherPath = [[UIBezierPath bezierPathWithRect:CGRectMake(_startPoint.x, _startPoint.y, rectWidth,rectHeight)] bezierPathByReversingPath];
[maskPath appendPath:otherPath];
//set mask
CAShapeLayer *maskLayer = [CAShapeLayer layer];
maskLayer.path = maskPath.CGPath;
[_blockView.layer setMask:maskLayer];
_blockView.hidden = false;
_selectView.hidden = true;
}
}
-(void) recover{
_blockView.hidden = true;
}
@end
희망이 있으면 도움이 될 것입니다.
매우 감사드립니다. 이는 관심 영역을 정의하는 데 도움이됩니다. 내 문제는 투자 수익 (ROI) 뒤에 있으며 맞춤 필터를 만드는 것 같습니다. – mownier