如何在iPhone中放大图像的选定区域? [英] How to zoom into a selected area of image in iPhone?

问题描述

我在单击该图像视图时有一个ImageView，应该创建一个透明的圆圈，然后再次双击该圆圈，应该放大该圆圈区域中的特定图像.任何建议都会受到赞赏.

I have an ImageView when clicked on that imageview, transparent circle should be created and again when double clicking on that circle, particular Image in that circle area should be zoomed.Any suggestion would be appreciated.

推荐答案

我认为这段代码将对您有所帮助

I think this code will helpfull to you

- (id)initWithImage:(UIImage *)image {
    self = [super initWithImage:image];
    if (self) {
        [self setUserInteractionEnabled:YES];

        UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleSingleTap:)];
        UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleDoubleTap:)];
        UITapGestureRecognizer *twoFingerTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTwoFingerTap:)];

        [doubleTap setNumberOfTapsRequired:2];
        [twoFingerTap setNumberOfTouchesRequired:2];

        [self addGestureRecognizer:singleTap];
        [self addGestureRecognizer:doubleTap];
        [self addGestureRecognizer:twoFingerTap];

        [singleTap release];
        [doubleTap release];
        [twoFingerTap release];
    }
    return self;
}

#pragma mark Private

- (void)handleSingleTap:(UIGestureRecognizer *)gestureRecognizer {
    if ([delegate respondsToSelector:@selector(tapDetectingImageView:gotSingleTapAtPoint:)])
        [delegate tapDetectingImageView:self gotSingleTapAtPoint:[gestureRecognizer locationInView:self]];
}

- (void)handleDoubleTap:(UIGestureRecognizer *)gestureRecognizer {
    if ([delegate respondsToSelector:@selector(tapDetectingImageView:gotDoubleTapAtPoint:)])
        [delegate tapDetectingImageView:self gotDoubleTapAtPoint:[gestureRecognizer locationInView:self]];
}

- (void)handleTwoFingerTap:(UIGestureRecognizer *)gestureRecognizer {
    if ([delegate respondsToSelector:@selector(tapDetectingImageView:gotTwoFingerTapAtPoint:)])
        [delegate tapDetectingImageView:self gotTwoFingerTapAtPoint:[gestureRecognizer locationInView:self]];
}

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