UIpangesture로 UIView 옮기기& 특정 프레임 넘어가지 않게 설정

소스

#import "ViewController.h"

@interface ViewController (){

//사진틀

IBOutlet UIImageView *myImageView;

//뷰파인더를 옮기기 전 위치

CGPoint beforPoint;

//뷰파인더

UIView *viewFinder;

//뷰파인더를 감싸고 있는 네 개의 점.

UIView *leftTopPoint;

UIView *rightTopPoint;

UIView *leftDownPoint;

UIView *rightDownPoint;

UIBezierPath *blackPath; //검은색 블러

UIBezierPath *framePath; //포커스

CAShapeLayer *fillLayer;

}

@end

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

//1.

blackPath = [UIBezierPath bezierPathWithRect:self.view.frame]; //흐리게 블러 처리할 부분 : View 전체 지정

//이미지뷰의 제일 왼쪽 모서리 구하기

float startXpoint = myImageView.frame.origin.x;

float startYpoint = myImageView.frame.origin.y;

//뷰파인더

viewFinder = [[UIView alloc] initWithFrame:CGRectMake(startXpoint, startYpoint, 100, 100)];

viewFinder.backgroundColor = [UIColor clearColor];

//viewFinder.center = self.view.center;

viewFinder.layer.borderColor = [UIColor lightGrayColor].CGColor;

viewFinder.layer.borderWidth= 1.0f;

[self.view addSubview:viewFinder];

framePath = [UIBezierPath bezierPathWithRect:viewFinder.frame];

[blackPath appendPath:framePath];

blackPath.usesEvenOddFillRule = YES;

//오버레이뷰 : 약간 어둡게

fillLayer = [CAShapeLayer layer];

fillLayer.path = blackPath.CGPath; //1.번에서 지정한 범위 그대로 설정

fillLayer.fillRule = kCAFillRuleEvenOdd;

fillLayer.fillColor = [UIColor blackColor].CGColor; //검은색 바탕

fillLayer.opacity = 0.4; //약간 흐리게

[self.view.layer addSublayer:fillLayer]; //루트뷰 레이어에 오버레이뷰 추가

//뷰파인더 위치 이동 제스쳐 이벤트

UIPanGestureRecognizer *panResizeGestureViewFinder =[[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(resizeTranslateViewFinder:)];

[viewFinder addGestureRecognizer:panResizeGestureViewFinder];

}

//파인더뷰 드래그

-(void)resizeTranslateViewFinder:(UIPanGestureRecognizer *) recognizer{

//드래그 후 위치값

CGPoint afterPoint = [recognizer locationInView:viewFinder.superview];

float finderX = viewFinder.frame.origin.x;

float finderY = viewFinder.frame.origin.y;

// float beforX = beforPoint.x;

// float beforY = beforPoint.y;

float afterX = afterPoint.x;

float afterY = afterPoint.y;

// NSLog(@"finderX : %f , finderY: %f" ,finderX , finderY);

// NSLog(@"beforX : %f , beforY: %f" ,beforX , beforY);

// NSLog(@"afterX : %f , afterY: %f" ,afterX , afterY);

if ([recognizer state] == UIGestureRecognizerStateBegan) {

NSLog(@"시작");

viewFinder.center = afterPoint; //뷰파인더 재할당

[self setTransParentViewFinderSetting]; //뷰파인더 셋팅

beforPoint = [recognizer locationInView:viewFinder.superview];

//[viewFinder setNeedsDisplay];

}else if([recognizer state] == UIGestureRecognizerStateChanged){

NSLog(@"중간");

//뷰 파인더가 이미지 뷰 가이드라인 넘어가지 않게 설정

[self actionViewFinderGuideLine:finderX and:finderY and:afterX and:afterY and :afterPoint];

}else if ([recognizer state] == UIGestureRecognizerStateEnded ){

NSLog(@"종료");

//뷰 파인더가 이미지 뷰 가이드라인 넘어가지 않게 설정

[self actionViewFinderGuideLine:finderX and:finderY and:afterX and:afterY and :afterPoint];

}

};

////뷰파인더(투명색) 위치 설정을 위한 메소드

-(void) setTransParentViewFinderSetting {

//검은색배경 위치와 오버레이뷰 해제

[blackPath removeAllPoints];

[fillLayer removeFromSuperlayer];

//검은색 바탕화면 다시 셋팅

blackPath = [UIBezierPath bezierPathWithRect:self.view.frame];

//드래그된 뷰파인더 위치를 framepath에(위치경로) 대입

framePath = [UIBezierPath bezierPathWithRect:viewFinder.frame];

//뷰파인더(투명) 경로를 검은색 바탕화면 경로에 더해주기

[blackPath appendPath:framePath];

blackPath.usesEvenOddFillRule = YES;

//오버레이뷰 : 약간 어둡게

fillLayer = [CAShapeLayer layer];

fillLayer.path = blackPath.CGPath; //1.번에서 지정한 범위 그대로 설정

fillLayer.fillRule = kCAFillRuleEvenOdd;

fillLayer.fillColor = [UIColor blackColor].CGColor; //검은색 바탕

fillLayer.opacity = 0.4; //약간 흐리게

[self.view.layer addSublayer:fillLayer]; //루트뷰 레이어에 오버레이뷰 추가

}

//뷰 파인더가 이미지 뷰 가이드라인 넘어가지 않게 설정

-(void)actionViewFinderGuideLine : (float) finderX and:(float)finderY and:(float)afterX and:(float)afterY and:(CGPoint)afterPoint{

//*왼쪽테두리 넘지 못함

if(finderX <= 0.0){

viewFinder.center = CGPointMake(50, afterY);