位移手勢辨識

#import <UIKit/UIKit.h>

@interface MyImageView : UIImageView{

    CGPoint startPoint;

}

@end

#import "MyImageView.h"

@implementation MyImageView

- (id)initWithFrame:(CGRect)frame

{

    self = [super initWithFrame:frame];

    if (self) {

        // Initialization code

    }

    return self;

}

-(id)initWithCoder:(NSCoder* )aDecoder{

    self = [super initWithCoder:aDecoder];

    if (self) {

        //啟動觸控

        self.userInteractionEnabled= YES;

        //設定圖檔

        self.image = [UIImage imageNamed:@"image4.jpg"];

        //加入手勢

        UIPanGestureRecognizer* pan = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(doMove:)];

        [self addGestureRecognizer:pan];

    }

    return self;

}

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

    //取得解控點

    CGPoint clickPoint = [recognizer translationInView:self];

    NSLog(@"Move的點是(%.1f,%.1f)",clickPoint.x,clickPoint.y);

    //開始移動

    CGPoint newPoint = CGPointMake(startPoint.x+clickPoint.x, startPoint.y+clickPoint.y);

    self.center = newPoint;

}

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{

    //取得觸控點

    CGPoint clickPoint = [[touches anyObject]locationInView:self];

    NSLog(@"觸控點在(%.1f,%.1f)",clickPoint.x,clickPoint.y);

    startPoint = clickPoint;

}

/*

// Only override drawRect: if you perform custom drawing.

// An empty implementation adversely affects performance during animation.

- (void)drawRect:(CGRect)rect

{

    // Drawing code

}

*/

@end