UI小案例-可移动、可缩放

//
//  ViewController.m
//  02--anniu按钮-勾了git
//
//  Created by LongMa on 15/8/29.
//  Copyright (c) movedDistance15年 itcast. All rights reserved.
//

#import "ViewController.h"
#define movedDistance 20
typedef enum
{
    topButton = 10,
    bottomButton,
    leftButton,
    rightButton,
    zoomOut,
    zoomIn
}kButton;

@interface ViewController ()
@property IBOutlet UIButton* buttonOfImage;
- (IBAction)move:(UIButton *)button;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.

}

- (IBAction)zoom:(UIButton*) button
{
    CGRect bounds = self.buttonOfImage.bounds;
    if (button.tag == zoomOut)
    {
        bounds.size.height += movedDistance;
        bounds.size.width  += movedDistance;
    }else
    {
        bounds.size.height -= movedDistance;
        bounds.size.width  -= movedDistance;
    }
    self.buttonOfImage.bounds = bounds;
    /*
    CGRect orgframe = self.buttonOfImage.frame;
    if (button.tag == zoomOut)
    {
        orgframe.size.height += movedDistance;
        orgframe.size.width  += movedDistance;
    }else
    {
        orgframe.size.height -= movedDistance;
        orgframe.size.width  -= movedDistance;
    }
    self.buttonOfImage.frame = orgframe;
     */

}

- (IBAction)move:(UIButton *)button
{
    //1.获取中心
    CGPoint center = self.buttonOfImage.center;
    //2.判断按钮并修改坐标
    switch (button.tag)
    {
        case topButton:
            center.y -= movedDistance;
            break;
        case bottomButton:
            center.y += movedDistance;
            break;
        case leftButton:
            center.x -= movedDistance;
            break;
        case rightButton:
            center.x += movedDistance;
            break;
        default:
            break;
    }
    //3.重新赋值
    self.buttonOfImage.center = center;
    /*
    CGRect frameOfImg = self.buttonOfImage.frame;//无 *
    switch (button.tag)
    {
        case topButton:
            frameOfImg.origin.y -= movedDistance;
            break;
        case bottomButton:
            frameOfImg.origin.y += movedDistance;
            break;
        case leftButton:
            frameOfImg.origin.x -= movedDistance;
            break;
        case rightButton:
            frameOfImg.origin.x += movedDistance;
            break;
        default:
            break;
    }

    self.buttonOfImage.frame = frameOfImg;
     */
}
@end