效果圖：

1.自定義要跟隨手指浮動的那個View

//
//  OrangeView.m
//  拖拽View跟隨手指浮動
//
//  Created by llkj on 2017/8/16.
//  Copyright © 2017年 LayneCheung. All rights reserved.
//

#import "OrangeView.h"

@implementation OrangeView

//當開始觸控式螢幕幕的時候呼叫
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{

    NSLog
 
(@"%s", __func__);
}

//觸控時開始移動時呼叫(移動時會持續呼叫)
//NSSet:無序
//NSArray:有序
- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{

    NSLog(@"%s", __func__);

    UITouch *touch = [touches anyObject];

    //求偏移量 = 手指當前點的X - 手指上一個點的X
    CGPoint currentPoint = [touch locationInView:self
 
];
    CGPoint prePoint = [touch previousLocationInView:self];

    NSLog(@"ccurrentPoint = %@", NSStringFromCGPoint(currentPoint));
    NSLog(@"prePiont = %@", NSStringFromCGPoint(prePoint));

    CGFloat offSetX = currentPoint.x - prePoint.x;
    CGFloat offSetY = currentPoint.y - prePoint.y;

    //平移
 

    self.transform = CGAffineTransformTranslate(self.transform, offSetX, offSetY);
}

//當手指離開螢幕時呼叫
-(void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{

    NSLog(@"%s", __func__);
}

//當發生系統事件時就會呼叫該方法(電話打入,自動關機)
- (void)touchesCancelled:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{

    NSLog(@"%s", __func__);
}
@end

2.建立自定義的View

在storyboard中拖一個View繫結他的類為OrangeView；
或者程式碼建立手動新增到控制器的View上去；