在Objective-C中，实现长按手势识别、UIPinchGestureRecognizer捏合手势和UIPanGestureRecognizer缩放手势需要利用UIGestureRecognizer类及其子类。以下是如何实现这几种手势识别的简单示例。

1. 实现长按手势识别

步骤：
- 使用UILongPressGestureRecognizer来检测长按手势。
- 将手势识别器添加到视图中。
- 为手势识别器的动作设置目标动作方法。

#import "ViewController.h"  
@interface ViewController ()  
@property (strong, nonatomic) UIView *targetView;  
@end  
@implementation ViewController  
- (void)viewDidLoad {  
    [super viewDidLoad];  
    self.targetView = [[UIView alloc] initWithFrame:CGRectMake(100, 100, 200, 200)];  
    self.targetView.backgroundColor = [UIColor blueColor];  
    [self.view addSubview:self.targetView];  
    UILongPressGestureRecognizer *longPressRecognizer =  
        [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleLongPress:)];  
    [self.targetView addGestureRecognizer:longPressRecognizer];  
}  
- (void)handleLongPress:(UILongPressGestureRecognizer *)gestureRecognizer {  
    if (gestureRecognizer.state == UIGestureRecognizerStateBegan) {  
        NSLog(@"Long press detected");  
        // Add custom logic here  
    }  
}  
@end  

2. 实现UIPinchGestureRecognizer捏合手势

步骤：
- 使用UIPinchGestureRecognizer来检测捏合手势。
- 将手势识别器添加到需要捏合手势的视图中。
- 设置目标动作来处理缩放操作。

@interface ViewController ()  
@property (strong, nonatomic) UIView *targetView;  
@end  
@implementation ViewController  
- (void)viewDidLoad {  
    [super viewDidLoad];  
    self.targetView = [[UIView alloc] initWithFrame:CGRectMake(100, 100, 200, 200)];  
    self.targetView.backgroundColor = [UIColor greenColor];  
    [self.view addSubview:self.targetView];  
    UIPinchGestureRecognizer *pinchRecognizer =  
        [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(handlePinch:)];  
    [self.targetView addGestureRecognizer:pinchRecognizer];  
}  
- (void)handlePinch:(UIPinchGestureRecognizer *)gestureRecognizer {  
    if (gestureRecognizer.state == UIGestureRecognizerStateChanged ||  
        gestureRecognizer.state == UIGestureRecognizerStateEnded) {  
        CGFloat scale = gestureRecognizer.scale;  
        self.targetView.transform = CGAffineTransformScale(self.targetView.transform, scale, scale);  
        gestureRecognizer.scale = 1.0;  
    }  
}  
@end  

3. 实现UIPanGestureRecognizer缩放手势

步骤：
- 使用UIPanGestureRecognizer来检测拖动手势。
- 将手势识别器添加到需要的视图中。
- 设置目标动作来处理视图位置的变更。

@interface ViewController ()  
@property (strong, nonatomic) UIView *targetView;  
@end  
@implementation ViewController  
- (void)viewDidLoad {  
    [super viewDidLoad];  
    self.targetView = [[UIView alloc] initWithFrame:CGRectMake(100, 100, 200, 200)];  
    self.targetView.backgroundColor = [UIColor redColor];  
    [self.view addSubview:self.targetView];  
    UIPanGestureRecognizer *panRecognizer =  
        [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePan:)];  
    [self.targetView addGestureRecognizer:panRecognizer];  
}  
- (void)handlePan:(UIPanGestureRecognizer *)gestureRecognizer {  
    CGPoint translation = [gestureRecognizer translationInView:self.view];  
    self.targetView.center = CGPointMake(self.targetView.center.x + translation.x, self.targetView.center.y + translation.y);  
    [gestureRecognizer setTranslation:CGPointZero inView:self.view];  
}  
@end  

这些示例展示了如何设置和使用这三种基本手势识别器，使您能够处理用户在应用中的交互。根据需要定制这些手势的处理逻辑，以实现更复杂的用户界面交互。