手势实现拖动旋转

import

@interface ImagHandlerView : UIView
@property(nonatomic,strong) void(^handleCompletionBlock)(UIImage* imge);
@end

import "ImagHandlerView.h"

@interface ImagHandlerView ()

@property(strong,nonatomic)UIImageView * imageView;

@end
@implementation ImagHandlerView

-(instancetype)initWithFrame:(CGRect)frame{

if (self = [super initWithFrame:frame]) {
    self.imageView = [[UIImageView alloc]initWithFrame:self.bounds];
    _imageView.userInteractionEnabled = YES;
    _imageView.backgroundColor = [UIColor orangeColor];
    [self addSubview:_imageView];
    self.backgroundColor = [UIColor clearColor];
    [self setUpGestureRecognizer];
}

return  self;

}

• (void)drawRect:(CGRect)rect {
  // Drawing code
  }

-(void)setUpGestureRecognizer{
/拖动/
UIPanGestureRecognizer * pan = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(pan:)];

[self.imageView addGestureRecognizer:pan];


/**
 旋转
 */
UIRotationGestureRecognizer * rotation = [[UIRotationGestureRecognizer alloc]initWithTarget:self action:@selector(rotation:)];

    [self.imageView addGestureRecognizer:rotation];

rotation.delegate = self;


/**
 缩放
 */
UIPinchGestureRecognizer  * pinch = [[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(pinch:)];

[self.imageView addGestureRecognizer:pinch];
pinch.delegate = self;


//长按
UILongPressGestureRecognizer  * longPress = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(longPress:)];

[self.imageView addGestureRecognizer:longPress];

}

-(void)pan:(UIPanGestureRecognizer*)pan{

//获取手指偏移量

CGPoint transP= [pan translationInView:self.imageView];
self.imageView.transform = CGAffineTransformTranslate(self.imageView.transform, transP.x, transP.y);

[pan setTranslation:CGPointZero inView:self.imageView];

}
-(void)rotation:(UIRotationGestureRecognizer*)rotation{
self.imageView.transform = CGAffineTransformRotate(self.imageView.transform, rotation.rotation);

rotation.rotation = 0;

}
-(void)pinch:(UIPinchGestureRecognizer)pinch{
self.imageView.transform = CGAffineTransformScale(self.imageView.transform, pinch.scale, pinch.scale) ;
pinch.scale = 1;
}
-(void)longPress:(UILongPressGestureRecognizer)longPress{

／／ 这里要注意 长安的状态 有开始。改变。和结束
if (longPress.state == UIGestureRecognizerStateBegan) {
    [UIView animateWithDuration:0.25 animations:^{
        self.imageView.alpha = 0;
    } completion:^(BOOL finished) {
        [UIView animateWithDuration:0.25 animations:^{
            
            self.imageView.alpha= 1.0;
        } completion:^(BOOL finished) {
            
            // 获取图片
            UIGraphicsBeginImageContextWithOptions(self.bounds.size, NO, 0);
            CGContextRef ref = UIGraphicsGetCurrentContext();
            [self.layer renderInContext:ref];
            
            UIImage *imge = UIGraphicsGetImageFromCurrentImageContext();
            UIGraphicsEndImageContext();
            
            self.handleCompletionBlock(imge);
            [self removeFromSuperview];
        }];
    }];
}

}

pragma mark 代理方法

// 实现这个地理方法这样的话 可用同时响应多个手势
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(nonnull UIGestureRecognizer *)otherGestureRecognizer{
return YES;
}

@end