在Objective C中实现界面缩放功能可以使用iOS中的UIPinchGestureRecognizer类来识别两个手指的捏合手势并进行相应的缩放操作。您可以将此类添加到您的视图控制器中，并使用回调方法来响应手势。具体的实现过程可参考下面的示例代码：
// 创建手势识别器 UIPinchGestureRecognizer *pinchGestureRecognizer = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(handlePinchGesture:)]; [self.view addGestureRecognizer:pinchGestureRecognizer];
// 缩放回调方法
(void)handlePinchGesture:(UIPinchGestureRecognizer *)recognizer { if (recognizer.state == UIGestureRecognizerStateBegan || recognizer.state == UIGestureRecognizerStateChanged) {
// 获取视图缩放比例 CGFloat scale = recognizer.scale; // 对视图进行缩放 recognizer.view.transform = CGAffineTransformScale(recognizer.view.transform, scale, scale); // 重置缩放比例，避免叠加效果 recognizer.scale = 1.0;}
}