1、監(jiān)聽手勢(shì)滑動(dòng)的方法

1-1摊聋、監(jiān)聽手勢(shì)開始接觸屏幕方法

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event

1-2隙券、監(jiān)聽手勢(shì)在屏幕上滑動(dòng)方法

- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event

1-3榜聂、監(jiān)聽手勢(shì)滑動(dòng)結(jié)束

- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event

2、完整Demo

2-1：通過手勢(shì)的滑動(dòng)來改變背景顏色的 alpha值

//
//  ViewController.m
//  66-手勢(shì)滑動(dòng)
//
//  Created by freedom on 16/10/17.
//  Copyright ? 2016年 Raven. All rights reserved.
//

#import "ViewController.h"
@interface ViewController ()
/**
 *  第一個(gè)點(diǎn)
 */
@property (nonatomic, assign) CGPoint firstPoint;

/**
 *  第二個(gè)點(diǎn)
 */
@property (nonatomic, assign) CGPoint secondPoint;
/**
 *  最開始的點(diǎn)
 */
@property (nonatomic, assign) CGPoint startPoint;
/**
 *  滾動(dòng)條
 */
@property (nonatomic, strong) UISlider *alider;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    CGFloat w = self.view.frame.size.width;
    CGFloat h = self.view.frame.size.height;
    
    
    UIView *blueView = [[UIView alloc] initWithFrame:CGRectMake(w-100, 100, 100, 100)];
    blueView.backgroundColor = [UIColor blueColor];
    [self.view addSubview:blueView];
    
    
    self.alider = [[UISlider alloc] initWithFrame:CGRectMake(0, 100, w-300, h)];
    self.alider.minimumValue = 0.0;
    self.alider.maximumValue = 1.0;
    self.alider.hidden = NO;
    self.alider.value = [UIScreen mainScreen].brightness;
    [self.view addSubview:self.alider];
}

#pragma mark -
#pragma mark 監(jiān)聽手勢(shì)方法
#pragma mark 1-開始接觸屏幕
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    //第一個(gè)點(diǎn)
    for (UITouch *touch in event.allTouches) {
        self.firstPoint = [touch locationInView:self.view];
    }
    
    self.startPoint = self.firstPoint;
    
}

#pragma mark 2-手勢(shì)在屏幕上滑動(dòng)
- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    //第二個(gè)點(diǎn)
    for (UITouch *touch in event.allTouches) {
        self.secondPoint = [touch locationInView:self.view];
    }
    self.alider.value += (self.firstPoint.y - self.secondPoint.y) / 500;
    NSLog(@"%f", self.alider.value);
    
    self.view.backgroundColor = [UIColor colorWithRed:self.alider.value green:0.0 blue:0.0 alpha:1.0];
    self.firstPoint = self.secondPoint;
}

#pragma mark 3-手勢(shì)在屏幕上滑動(dòng)結(jié)束
- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    self.firstPoint = self.secondPoint = CGPointZero;
}


@end

3陌凳、小結(jié)

3-1剥懒、之所以使用UISlider是因?yàn)閁ISlider的值是從0~1來變化的，所以個(gè)人覺得合敦，如果以后有什么需要線性變化都可以使用UISlider

3-2初橘、演示時(shí)發(fā)現(xiàn)，如果UISlider顯示出來（具有frame、hidden=NO）時(shí)保檐，會(huì)發(fā)現(xiàn)具有UISlider區(qū)域的上面下面就不會(huì)具有滑動(dòng)時(shí)間耕蝉，所以建議隱藏UISlider