11--tag 和transform属性

tag 和transform属性

1.tag 标签，就相当于身份识别的标码，可以通过tag值获取对应的对象。

2.使用transform 实现对象的平移和旋转。

 //
 //  ViewController.m
 //  04-transform 使用
 //
 //  Created by Stephen on 16/4/12.
 //  Copyright © 2016年 Stephen. All rights reserved.
 //

 #import "ViewController.h"

 @interface ViewController ()

 - (IBAction)up;

 //@property (weak, nonatomic) IBOutlet UIButton *head;
 - (IBAction)rotate;

 @end

 @implementation ViewController

 - (IBAction)up {
     //1.取得图像按钮
     UIButton *head = (UIButton *)[self.view viewWithTag:];
   //2.
    // head.transform = CGAffineTransformMakeTranslation(0, -20); // 永远只对原点进行20单位的位移

     //叠加位移
     head.transform = CGAffineTransformTranslate(head.transform, , -); //每次都是进行20的位移

 }
 - (IBAction)rotate
 {
     UIButton *head = (UIButton *)[self.view viewWithTag:];

    // head.transform = CGAffineTransformMakeRotation(M_PI_4);

     head.transform =CGAffineTransformRotate(head.transform, M_PI_4);
 }
 @end