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【移动应用开发技术】iOS中如何实现动态区域裁剪图片功能

前言显示图片与裁剪区域支持移动和缩放图片支持手势改变裁剪区域显示图片与裁剪区域显示图片/upload/information/20200623/126/120610.jpg/upload/information/20200623/126/120611.jpg/upload/information/20200623/126/120612.jpg/upload/information/20200623/126/120614.jpg裁剪区域/upload/information/20200623/126/120616.jpg#import

<QuartzCore/QuartzCore.h>

@interface

YasicClipAreaLayer

:

CAShapeLayer

@property(assign,

nonatomic)

NSInteger

cropAreaLeft;

@property(assign,

nonatomic)

NSInteger

cropAreaTop;

@property(assign,

nonatomic)

NSInteger

cropAreaRight;

@property(assign,

nonatomic)

NSInteger

cropAreaBottom;

-

(void)setCropAreaLeft:(NSInteger)cropAreaLeft

CropAreaTop:(NSInteger)cropAreaTop

CropAreaRight:(NSInteger)cropAreaRight

CropAreaBottom:(NSInteger)cropAreaBottom;

@end

@implementation

YasicClipAreaLayer

-

(instancetype)init

{

self

=

[super

init];

if

(self)

{

_cropAreaLeft

=

50;

_cropAreaTop

=

50;

_cropAreaRight

=

SCREEN_WIDTH

-

self.cropAreaLeft;

_cropAreaBottom

=

400;

}

return

self;

}

-

(void)drawInContext:(CGContextRef)ctx

{

UIGraphicsPushContext(ctx);

CGContextSetStrokeColorWithColor(ctx,

[UIColor

whiteColor].CGColor);

CGContextSetLineWidth(ctx,

lineWidth);

CGContextMoveToPoint(ctx,

self.cropAreaLeft,

self.cropAreaTop);

CGContextAddLineToPoint(ctx,

self.cropAreaLeft,

self.cropAreaBottom);

CGContextSetShadow(ctx,

CGSizeMake(2,

0),

2.0);

CGContextStrokePath(ctx);

CGContextSetStrokeColorWithColor(ctx,

[UIColor

whiteColor].CGColor);

CGContextSetLineWidth(ctx,

lineWidth);

CGContextMoveToPoint(ctx,

self.cropAreaLeft,

self.cropAreaTop);

CGContextAddLineToPoint(ctx,

self.cropAreaRight,

self.cropAreaTop);

CGContextSetShadow(ctx,

CGSizeMake(0,

2),

2.0);

CGContextStrokePath(ctx);

CGContextSetStrokeColorWithColor(ctx,

[UIColor

whiteColor].CGColor);

CGContextSetLineWidth(ctx,

lineWidth);

CGContextMoveToPoint(ctx,

self.cropAreaRight,

self.cropAreaTop);

CGContextAddLineToPoint(ctx,

self.cropAreaRight,

self.cropAreaBottom);

CGContextSetShadow(ctx,

CGSizeMake(-2,

0),

2.0);

CGContextStrokePath(ctx);

CGContextSetStrokeColorWithColor(ctx,

[UIColor

whiteColor].CGColor);

CGContextSetLineWidth(ctx,

lineWidth);

CGContextMoveToPoint(ctx,

self.cropAreaLeft,

self.cropAreaBottom);

CGContextAddLineToPoint(ctx,

self.cropAreaRight,

self.cropAreaBottom);

CGContextSetShadow(ctx,

CGSizeMake(0,

-2),

2.0);

CGContextStrokePath(ctx);

UIGraphicsPopContext();

}

-

(void)setCropAreaLeft:(NSInteger)cropAreaLeft

{

_cropAreaLeft

=

cropAreaLeft;

[self

setNeedsDisplay];

}

-

(void)setCropAreaTop:(NSInteger)cropAreaTop

{

_cropAreaTop

=

cropAreaTop;

[self

setNeedsDisplay];

}

-

(void)setCropAreaRight:(NSInteger)cropAreaRight

{

_cropAreaRight

=

cropAreaRight;

[self

setNeedsDisplay];

}

-

(void)setCropAreaBottom:(NSInteger)cropAreaBottom

{

_cropAreaBottom

=

cropAreaBottom;

[self

setNeedsDisplay];

}

-

(void)setCropAreaLeft:(NSInteger)cropAreaLeft

CropAreaTop:(NSInteger)cropAreaTop

CropAreaRight:(NSInteger)cropAreaRight

CropAreaBottom:(NSInteger)cropAreaBottom

{

_cropAreaLeft

=

cropAreaLeft;

_cropAreaRight

=

cropAreaRight;

_cropAreaTop

=

cropAreaTop;

_cropAreaBottom

=

cropAreaBottom;

[self

setNeedsDisplay];

}

@end

self.cropView.layer.sublayers

=

nil;

YasicClipAreaLayer

*

layer

=

[[YasicClipAreaLayer

alloc]

init];

CGRect

cropframe

=

CGRectMake(self.cropAreaX,

self.cropAreaY,

self.cropAreaWidth,

self.cropAreaHeight);

UIBezierPath

*

path

=

[UIBezierPath

bezierPathWithRoundedRect:self.cropView.frame

cornerRadius:0];

UIBezierPath

*

cropPath

=

[UIBezierPath

bezierPathWithRect:cropframe];

[path

appendPath:cropPath];

layer.path

=

path.CGPath;

layer.fillRule

=

kCAFillRuleEvenOdd;

layer.fillColor

=

[[UIColor

blackColor]

CGColor];

layer.opacity

=

0.5;

layer.frame

=

self.cropView.bounds;

[layer

setCropAreaLeft:self.cropAreaX

CropAreaTop:self.cropAreaY

CropAreaRight:self.cropAreaX

+

self.cropAreaWidth

CropAreaBottom:self.cropAreaY

+

self.cropAreaHeight];

[self.cropView.layer

addSublayer:layer];

[self.view

bringSubviewToFront:self.cropView];/upload/information/20200623/126/120618.pngCGRect

cropframe

=

CGRectMake(self.cropAreaX,

self.cropAreaY,

self.cropAreaWidth,

self.cropAreaHeight);

UIBezierPath

*

path

=

[UIBezierPath

bezierPathWithRoundedRect:self.cropView.frame

cornerRadius:0];

UIBezierPath

*

cropPath

=

[UIBezierPath

bezierPathWithRect:cropframe];

[path

appendPath:cropPath];

layer.path

=

path.CGPath;

layer.fillRule

=

kCAFillRuleEvenOdd;

layer.fillColor

=

[[UIColor

blackColor]

CGColor];

layer.opacity

=

0.5;

layer.frame

=

self.cropView.bounds;/upload/information/20200623/126/120620.png/upload/information/20200623/126/120621.png

[layer

setCropAreaLeft:self.cropAreaX

CropAreaTop:self.cropAreaY

CropAreaRight:self.cropAreaX

+

self.cropAreaWidth

CropAreaBottom:self.cropAreaY

+

self.cropAreaHeight];

[self.cropView.layer

addSublayer:layer];

[self.view

bringSubviewToFront:self.cropView];合理放置图片/upload/information/20200623/126/120622.png

CGFloat

tempWidth

=

0.0;

CGFloat

tempHeight

=

0.0;

if

(self.targetImage.size.width/self.cropAreaWidth

<=

self.targetImage.size.height/self.cropAreaHeight)

{

tempWidth

=

self.cropAreaWidth;

tempHeight

=

(tempWidth/self.targetImage.size.width)

*

self.targetImage.size.height;

}

else

if

(self.targetImage.size.width/self.cropAreaWidth

>

self.targetImage.size.height/self.cropAreaHeight)

{

tempHeight

=

self.cropAreaHeight;

tempWidth

=

(tempHeight/self.targetImage.size.height)

*

self.targetImage.size.width;

}

[self.bigImageView

mas_updateConstraints:^(MASConstraintMaker

*make)

{

make.left.mas_equalTo(self.cropAreaX

-

(tempWidth

-

self.cropAreaWidth)/2);

make.top.mas_equalTo(self.cropAreaY

-

(tempHeight

-

self.cropAreaHeight)/2);

make.width.mas_equalTo(tempWidth);

make.height.mas_equalTo(tempHeight);

}];/upload/information/20200623/126/120623.jpg支持移动和缩放图片缩放功能self.originalFrame

=

CGRectMake(self.cropAreaX

-

(tempWidth

-

self.cropAreaWidth)/2,

self.cropAreaY

-

(tempHeight

-

self.cropAreaHeight)/2,

tempWidth,

tempHeight);

//

捏合手势

UIPinchGestureRecognizer

*pinGesture

=

[[UIPinchGestureRecognizer

alloc]

initWithTarget:self

action:@selector(handleCenterPinGesture:)];

[self.view

addGestureRecognizer:pinGesture];-(void)handleCenterPinGesture:(UIPinchGestureRecognizer

*)pinGesture

{

CGFloat

scaleRation

=

3;

UIView

*

view

=

self.bigImageView;

//

缩放开始与缩放中

if

(pinGesture.state

==

UIGestureRecognizerStateBegan

||

pinGesture.state

==

UIGestureRecognizerStateChanged)

{

//

移动缩放中心到手指中心

CGPoint

pinchCenter

=

[pinGesture

locationInView:view.superview];

CGFloat

distanceX

=

view.frame.origin.x

-

pinchCenter.x;

CGFloat

distanceY

=

view.frame.origin.y

-

pinchCenter.y;

CGFloat

scaledDistanceX

=

distanceX

*

pinGesture.scale;

CGFloat

scaledDistanceY

=

distanceY

*

pinGesture.scale;

CGRect

newFrame

=

CGRectMake(view.frame.origin.x

+

scaledDistanceX

-

distanceX,

view.frame.origin.y

+

scaledDistanceY

-

distanceY,

view.frame.size.width

*

pinGesture.scale,

view.frame.size.height

*

pinGesture.scale);

view.frame

=

newFrame;

pinGesture.scale

=

1;

}

//

缩放结束

if

(pinGesture.state

==

UIGestureRecognizerStateEnded)

{

CGFloat

ration

=

view.frame.size.width

/

self.originalFrame.size.width;

//

缩放过大

if

(ration

>

5)

{

CGRect

newFrame

=

CGRectMake(0,

0,

self.originalFrame.size.width

*

scaleRation,

self.originalFrame.size.height

*

scaleRation);

view.frame

=

newFrame;

}

//

缩放过小

if

(ration

<

0.25)

{

view.frame

=

self.originalFrame;

}

//

对图片进行位置修正

CGRect

resetPosition

=

CGRectMake(view.frame.origin.x,

view.frame.origin.y,

view.frame.size.width,

view.frame.size.height);

if

(resetPosition.origin.x

>=

self.cropAreaX)

{

resetPosition.origin.x

=

self.cropAreaX;

}

if

(resetPosition.origin.y

>=

self.cropAreaY)

{

resetPosition.origin.y

=

self.cropAreaY;

}

if

(resetPosition.size.width

+

resetPosition.origin.x

<

self.cropAreaX

+

self.cropAreaWidth)

{

CGFloat

movedLeftX

=

fabs(resetPosition.size.width

+

resetPosition.origin.x

-

(self.cropAreaX

+

self.cropAreaWidth));

resetPosition.origin.x

+=

movedLeftX;

}

if

(resetPosition.size.height

+

resetPosition.origin.y

<

self.cropAreaY

+

self.cropAreaHeight)

{

CGFloat

moveUpY

=

fabs(resetPosition.size.height

+

resetPosition.origin.y

-

(self.cropAreaY

+

self.cropAreaHeight));

resetPosition.origin.y

+=

moveUpY;

}

view.frame

=

resetPosition;

//

对图片缩放进行比例修正，防止过小

if

(self.cropAreaX

<

self.bigImageView.frame.origin.x

||

((self.cropAreaX

+

self.cropAreaWidth)

>

self.bigImageView.frame.origin.x

+

self.bigImageView.frame.size.width)

||

self.cropAreaY

<

self.bigImageView.frame.origin.y

||

((self.cropAreaY

+

self.cropAreaHeight)

>

self.bigImageView.frame.origin.y

+

self.bigImageView.frame.size.height))

{

view.frame

=

self.originalFrame;

}

}

}

if

(pinGesture.state

==

UIGestureRecognizerStateBegan

||

pinGesture.state

==

UIGestureRecognizerStateChanged)

{

//

移动缩放中心到手指中心

CGPoint

pinchCenter

=

[pinGesture

locationInView:view.superview];

CGFloat

distanceX

=

view.frame.origin.x

-

pinchCenter.x;

CGFloat

distanceY

=

view.frame.origin.y

-

pinchCenter.y;

CGFloat

scaledDistanceX

=

distanceX

*

pinGesture.scale;

CGFloat

scaledDistanceY

=

distanceY

*

pinGesture.scale;

CGRect

newFrame

=

CGRectMake(view.frame.origin.x

+

scaledDistanceX

-

distanceX,

view.frame.origin.y

+

scaledDistanceY

-

distanceY,

view.frame.size.width

*

pinGesture.scale,

view.frame.size.height

*

pinGesture.scale);

view.frame

=

newFrame;

pinGesture.scale

=

1;

}

CGRect

newFrame

=

CGRectMake(view.frame.origin.x

+

scaledDistanceX

-

distanceX,

view.frame.origin.y

+

scaledDistanceY

-

distanceY,

view.frame.size.width

*

pinGesture.scale,

view.frame.size.height

*

pinGesture.scale);CGFloat

ration

=

view.frame.size.width

/

self.originalFrame.size.width;

//

缩放过大

if

(ration

>

5)

{

CGRect

newFrame

=

CGRectMake(0,

0,

self.originalFrame.size.width

*

scaleRation,

self.originalFrame.size.height

*

scaleRation);

view.frame

=

newFrame;

}

//

缩放过小

if

(ration

<

0.25)

{

view.frame

=

self.originalFrame;

}//

对图片进行位置修正

CGRect

resetPosition

=

CGRectMake(view.frame.origin.x,

view.frame.origin.y,

view.frame.size.width,

view.frame.size.height);

if

(resetPosition.origin.x

>=

self.cropAreaX)

{

resetPosition.origin.x

=

self.cropAreaX;

}

if

(resetPosition.origin.y

>=

self.cropAreaY)

{

resetPosition.origin.y

=

self.cropAreaY;

}

if

(resetPosition.size.width

+

resetPosition.origin.x

<

self.cropAreaX

+

self.cropAreaWidth)

{

CGFloat

movedLeftX

=

fabs(resetPosition.size.width

+

resetPosition.origin.x

-

(self.cropAreaX

+

self.cropAreaWidth));

resetPosition.origin.x

+=

movedLeftX;

}

if

(resetPosition.size.height

+

resetPosition.origin.y

<

self.cropAreaY

+

self.cropAreaHeight)

{

CGFloat

moveUpY

=

fabs(resetPosition.size.height

+

resetPosition.origin.y

-

(self.cropAreaY

+

self.cropAreaHeight));

resetPosition.origin.y

+=

moveUpY;

}

view.frame

=

resetPosition;/upload/information/20200623/126/120624.png

//

对图片缩放进行比例修正，防止过小

if

(self.cropAreaX

<

self.bigImageView.frame.origin.x

||

((self.cropAreaX

+

self.cropAreaWidth)

>

self.bigImageView.frame.origin.x

+

self.bigImageView.frame.size.width)

||

self.cropAreaY

<

self.bigImageView.frame.origin.y

||

((self.cropAreaY

+

self.cropAreaHeight)

>

self.bigImageView.frame.origin.y

+

self.bigImageView.frame.size.height))

{

view.frame

=

self.originalFrame;

}移动功能

CGPoint

translation

=

[panGesture

translationInView:view.superview];

[view

setCenter:CGPointMake(view.center.x

+

translation.x,

view.center.y

+

translation.y)];

[panGesture

setTranslation:CGPointZero

inView:view.superview];

CGRect

currentFrame

=

view.frame;

if

(currentFrame.origin.x

>=

self.cropAreaX)

{

currentFrame.origin.x

=

self.cropAreaX;

}

if

(currentFrame.origin.y

>=

self.cropAreaY)

{

currentFrame.origin.y

=

self.cropAreaY;

}

if

(currentFrame.size.width

+

currentFrame.origin.x

<

self.cropAreaX

+

self.cropAreaWidth)

{

CGFloat

movedLeftX

=

fabs(currentFrame.size.width

+

currentFrame.origin.x

-

(self.cropAreaX

+

self.cropAreaWidth));

currentFrame.origin.x

+=

movedLeftX;

}

if

(currentFrame.size.height

+

currentFrame.origin.y

<

self.cropAreaY

+

self.cropAreaHeight)

{

CGFloat

moveUpY

=

fabs(currentFrame.size.height

+

currentFrame.origin.y

-

(self.cropAreaY

+

self.cropAreaHeight));

currentFrame.origin.y

+=

moveUpY;

}

[UIView

animateWithDuration:0.3

animations:^{

[view

setFrame:currentFrame];

}];支持手势改变裁剪区域typedef

NS_ENUM(NSInteger,

ACTIVEGESTUREVIEW)

{

CROPVIEWLEFT,

CROPVIEWRIGHT,

CROPVIEWTOP,

CROPVIEWBOTTOM,

BIGIMAGEVIEW

};@property(assign,

nonatomic)

ACTIVEGESTUREVIEW

activeGestureView;@interface

YasicPanGestureRecognizer

:

UIPanGestureRecognizer

@property(assign,

nonatomic)

CGPoint

beginPoint;

@property(assign,

nonatomic)

CGPoint

movePoint;

-(instancetype)initWithTarget:(id)target

action:(SEL)action

inview:(UIView*)view;

@end

@interface

YasicPanGestureRecognizer()

@property(strong,

nonatomic)

UIView

*targetView;

@end

@implementation

YasicPanGestureRecognizer

-(instancetype)initWithTarget:(id)target

action:(SEL)action

inview:(UIView*)view{

self

=

[super

initWithTarget:target

action:action];

if(self)

{

self.targetView

=

view;

}

return

self;

}

-

(void)touchesBegan:(NSSet

*)touches

withEvent:(UIEvent*)event{

[super

touchesBegan:touches

withEvent:event];

UITouch

*touch

=

[touches

anyObject];

self.beginPoint

=

[touch

locationInView:self.targetView];

}

-

(void)touchesMoved:(NSSet<UITouch

*>

*)touches

withEvent:(UIEvent

*)event

{

[super

touchesMoved:touches

withEvent:event];

UITouch

*touch

=

[touches

anyObject];

self.movePoint

=

[touch

locationInView:self.targetView];

}

@end

//

拖动手势

YasicPanGestureRecognizer

*panGesture

=

[[YasicPanGestureRecognizer

alloc]

initWithTarget:self

action:@selector(handleDynamicPanGesture:)

inview:self.cropView];

[self.cropView

addGestureRecognizer:panGesture];手势开始时//

开始滑动时判断滑动对象是

ImageView

还是

Layer

上的

Line

if

(panGesture.state

==

UIGestureRecognizerStateBegan)

{

if

(beginPoint.x

>=

self.cropAreaX

-

judgeWidth

&&

beginPoint.x

<=

self.cropAreaX

+

judgeWidth

&&

beginPoint.y

>=

self.cropAreaY

&&

beginPoint.y

<=

self.cropAreaY

+

self.cropAreaHeight

&&

self.cropAreaWidth

>=

50)

{

self.activeGestureView

=

CROPVIEWLEFT;

}

else

if

(beginPoint.x

>=

self.cropAreaX

+

self.cropAreaWidth

-

judgeWidth

&&

beginPoint.x

<=

self.cropAreaX

+

self.cropAreaWidth

+

judgeWidth

&&

beginPoint.y

>=

self.cropAreaY

&&

beginPoint.y

<=

self.cropAreaY

+

self.cropAreaHeight

&&

self.cropAreaWidth

>=

50)

{

self.activeGestureView

=

CROPVIEWRIGHT;

}

else

if

(beginPoint.y

>=

self.cropAreaY

-

judgeWidth

&&

beginPoint.y

<=

self.cropAreaY

+

judgeWidth

&&

beginPoint.x

>=

self.cropAreaX

&&

beginPoint.x

<=

self.cropAreaX

+

self.cropAreaWidth

&&

self.cropAreaHeight

>=

50)

{

self.activeGestureView

=

CROPVIEWTOP;

}

else

if

(beginPoint.y

>=

self.cropAreaY

+

self.cropAreaHeight

-

judgeWidth

&&

beginPoint.y

<=

self.cropAreaY

+

self.cropAreaHeight

+

judgeWidth

&&

beginPoint.x

>=

self.cropAreaX

&&

beginPoint.x

<=

self.cropAreaX

+

self.cropAreaWidth

&&

self.cropAreaHeight

>=

50)

{

self.activeGestureView

=

CROPVIEWBOTTOM;

}

else

{

self.activeGestureView

=

BIGIMAGEVIEW;

[view

setCenter:CGPointMake(view.center.x

+

translation.x,

view.center.y

+

translation.y)];

[panGesture

setTranslation:CGPointZero

inView:view.superview];

}

}手势进行时//

滑动过程中进行位置改变

if

(panGesture.state

==

UIGestureRecognizerStateChanged)

{

CGFloat

diff

=

0;

switch

(self.activeGestureView)

{

case

CROPVIEWLEFT:

{

diff

=

movePoint.x

-

self.cropAreaX;

if

(diff

>=

0

&&

self.cropAreaWidth

>

50)

{

self.cropAreaWidth

-=

diff;

self.cropAreaX

+=

diff;

}

else

if

(diff

<

0

&&

self.cropAreaX

>

self.bigImageView.frame.origin.x

&&

self.cropAreaX

>=

15)

{

self.cropAreaWidth

-=

diff;

self.cropAreaX

+=

diff;

}

[self

setUpCropLayer];

break;

}

case

CROPVIEWRIGHT:

{

diff

=

movePoint.x

-

self.cropAreaX

-

self.cropAreaWidth;

if

(diff

>=

0

&&

(self.cropAreaX

+

self.cropAreaWidth)

<

MIN(self.bigImageView.frame.origin.x

+

self.bigImageView.frame.size.width,

self.cropView.frame.origin.x

+

self.cropView.frame.size.width

-

15)){

self.cropAreaWidth

+=

diff;

}

else

if

(diff

<

0

&&

self.cropAreaWidth

>=

50)

{

self.cropAreaWidth

+=

diff;

}

[self

setUpCropLayer];

break;

}

case

CROPVIEWTOP:

{

diff

=

movePoint.y

-

self.cropAreaY;

if

(diff

>=

0

&&

self.cropAreaHeight

>

50)

{

self.cropAreaHeight

-=

diff;

self.cropAreaY

+=

diff;

}

else

if

(diff

<

0

&&

self.cropAreaY

>

self.bigImageView.frame.origin.y

&&

self.cropAreaY

>=

15)

{

self.cropAreaHeight

-=

diff;

self.cropAreaY

+=

diff;

}

[self

setUpCropLayer];

break;

}

case

CROPVIEWBOTTOM:

{

diff

=

movePoint.y

-

self.cropAreaY

-

self.cropAreaHeight;

if

(diff

>=

0

&&

(self.cropAreaY

+

self.cropAreaHeight)

<

MIN(self.bigImageView.frame.origin.y

+

self.bigImageView.frame.size.height,

self.cropView.frame.origin.y

+

self.cropView.frame.size.height

-

15)){

self.cropAreaHeight

+=

diff;

}

else

if

(diff

<

0

&&

self.cropAreaHeight

>=

50)

{

self.cropAreaHeight

+=

diff;

}

[self

setUpCropLayer];

break;

}

case

BIGIMAGEVIEW:

{

[view

setCenter:CGPointMake(view.center.x

+

translation.x,

view.center.y

+

translation.y)];

[panGesture

setTranslation:CGPointZero

inView:view.superview];

break;

}

default:

break;

}

}手势结束时

//

滑动结束后进行位置修正

if

(panGesture.state

==

UIGestureRecognizerStateEnded)

{

switch

(self.activeGestureView)

{

case

CROPVIEWLEFT:

{

if

(self.cropAreaWidth

<

50)

{

self.cropAreaX

-=

50

-

self.cropAreaWidth;

self.cropAreaWidth

=

50;

}

if

(self.cropAreaX

<

MAX(self.bigImageView.frame.origin.x,

15))

{

CGFloat

temp

=

self.cropAreaX

+

self.cropAreaWidth;

self.cropAreaX

=

MAX(self.bigImageView.frame.origin.x,

15);

self.cropAreaWidth

=

temp

-

self.cropAreaX;

}

[self

setUpCropLayer];

break;

}

case

CROPVIEWRIGHT:

{

if

(self.cropAreaWidth

<

50)

{

self.cropAreaWidth

=

50;

}

if

(self.cropAreaX

+

self.cropAreaWidth

>

MIN(self.bigImageView.frame.origin.x

+

self.bigImageView.frame.size.width,

self.cropView.frame.origin.x

+

self.cropView.frame.size.width

-

15))

{

self.cropAreaWidth

=

MIN(self.bigImageView.frame.origin.x

+

self.bigImageView.frame.size.width,

self.cropView.frame.origin.x

+

self.cropView.frame.size.width

-

15)

-

self.cropAreaX;

}

[self

setUpCropLayer];

break;

}

case

CROPVIEWTOP:

{

if

(self.cropAreaHeight

<

50)

{

self.cropAreaY

-=

50

-

self.cropAreaHeight;

self.cropAreaHeight

=

50;

}

if

(self.cropAreaY

<

MAX(self.bigImageView.frame.origin.y,

15))

{

CGFloat

temp

=

self.cropAreaY

+

self.cropAreaHeight;

self.cropAreaY

=

MAX(self.bigImageView.frame.origin.y,

15);

self.cropAreaHeight

=

temp

-

self.cropAreaY;

}

[self

setUpCropLayer];

break;

}

case

CROPVIEWBOTTOM:

{

if

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