纯代码transform位移伸缩和旋转

//
//  LWTViewController.m
//  纯代码位移和伸缩作业
//
//  Created by apple on 14-5-20.
//  Copyright (c) 2014年 lwt. All rights reserved.
//

#import "LWTViewController.h"
#pragma mark 定义常量
/** 图片距离顶部的高度 */
#define KImageY 60
/** 图片的尺寸 */
#define KImageWidth 100
/** 按钮的尺寸 */
#define KMoveButton 40
/** 图片平移的距离 */
#define KMovingDelta 20

/** 定义平移tag的枚举 */
typedef enum {
    KMoveDirTop = 1,
    KMoveDirLeft,
    KMoveDirBottom,
    KMoveDirRight
} KMoveDir;

@interface LWTViewController ()

/** 图片的属性 */
@property (nonatomic, strong) UIButton *imageView;

/** 平移按钮的属性 */
@property (nonatomic, strong) UIButton *topBtn;
@property (nonatomic, strong) UIButton *leftBtn;
@property (nonatomic, strong) UIButton *bottomBtn;
@property (nonatomic, strong) UIButton *rightBtn;

@end

@implementation LWTViewController


- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
    // 创建要移动的图片按钮
    UIButton *imageViewButton = [[UIButton alloc] init];
    // 按钮位置
    CGFloat imageX = (self.view.frame.size.width - KImageWidth) / 2;
    imageViewButton.frame = CGRectMake(imageX, KImageY, KImageWidth, KImageWidth);
    
    // 按钮默认背景
    UIImage *image = [UIImage imageNamed:@"btn_01"];
    [imageViewButton setBackgroundImage:image forState:UIControlStateNormal];
    
    // 按钮默认文字
    [imageViewButton setTitle:@"点我啊" forState:UIControlStateNormal];
    [imageViewButton setTitleColor:[UIColor redColor] forState:UIControlStateNormal];
    
    // 按钮高亮背景
    UIImage *imageHighed = [UIImage imageNamed:@"btn_02"];
    [imageViewButton setBackgroundImage:imageHighed forState:UIControlStateHighlighted];
    
    // 按钮高亮文字
    [imageViewButton setTitle:@"点我干啥" forState:UIControlStateHighlighted];
    [imageViewButton setTitleColor:[UIColor magentaColor] forState:UIControlStateHighlighted];
    
    [self.view addSubview:imageViewButton];
    
    _imageView = imageViewButton;
    
    // 创建移动按钮
    
    // 上
    UIButton *topButton = [self createButton:@"top" andTag:KMoveDirTop andPoint:CGPointMake(60, 320)];
    // 监听点击事件
    [topButton addTarget:self action:@selector(move:) forControlEvents:UIControlEventTouchUpInside];
    // 属性赋值
    self.topBtn = topButton;
    
    //左
    UIButton *leftButton = [self createButton:@"left" andTag:KMoveDirLeft andPoint:CGPointMake(20, 360)];
    // 监听点击事件
    [leftButton addTarget:self action:@selector(move:) forControlEvents:UIControlEventTouchUpInside];
    // 属性赋值
    self.leftBtn = leftButton;
    
    //下
    UIButton *bottomButton = [self createButton:@"bottom" andTag:KMoveDirBottom andPoint:CGPointMake(60, 400)];
    // 监听点击事件
    [bottomButton addTarget:self action:@selector(move:) forControlEvents:UIControlEventTouchUpInside];
    // 属性赋值
    self.bottomBtn = bottomButton;
    
    //右
    UIButton *rightButton = [self createButton:@"right" andTag:KMoveDirRight andPoint:CGPointMake(100, 360)];
    // 监听点击事件
    [rightButton addTarget:self action:@selector(move:) forControlEvents:UIControlEventTouchUpInside];
    // 属性赋值
    self.rightBtn = rightButton;
    
    // 创建伸缩按钮
    // 放大
    UIButton *plusButton = [self createButton:@"plus" andTag:1 andPoint:CGPointMake(180, 320)];
    // 监听点击事件
    [plusButton addTarget:self action:@selector(scale:) forControlEvents:UIControlEventTouchUpInside];
    
    // 缩小
    UIButton *minusButton = [self createButton:@"minus" andTag:0 andPoint:CGPointMake(240, 320)];
    // 监听点击事件
    [minusButton addTarget:self action:@selector(scale:) forControlEvents:UIControlEventTouchUpInside];
    
    // 创建旋转按钮
    //逆时针
    UIButton *leftRotateButton = [self createButton:@"left_rotate" andTag:-1 andPoint:CGPointMake(180, 400)];
    // 监听点击事件
    [leftRotateButton addTarget:self action:@selector(rotate:) forControlEvents:UIControlEventTouchUpInside];
    
    //顺时针
    UIButton *rightRotateButton = [self createButton:@"right_rotate" andTag:1 andPoint:CGPointMake(240, 400)];
    // 监听点击事件
    [rightRotateButton addTarget:self action:@selector(rotate:) forControlEvents:UIControlEventTouchUpInside];
    
}

#pragma mark - 实现方法
/** 创建按钮 默认和高亮的图片名称相近，x，y是位置是手动布局的 */
- (UIButton *) createButton:(NSString *)location andTag: (int)tag andPoint : (CGPoint)point
{
    UIButton *btn = [[UIButton alloc] init];
    
    btn.frame = (CGRect){point,KMoveButton, KMoveButton};
    // 背景
    NSString *normal = [NSString stringWithFormat:@"%@_normal",location];
    UIImage *upImage = [UIImage imageNamed:normal];
    [btn setBackgroundImage:upImage forState:UIControlStateNormal];
    
    //高亮背景
    NSString *highlighted = [NSString stringWithFormat:@"%@_highlighted",location];
    UIImage *upImageHighed = [UIImage imageNamed:highlighted];
    [btn setBackgroundImage:upImageHighed forState:UIControlStateHighlighted];
    // tag
    btn.tag = tag;
    [self.view addSubview:btn];
    return btn;
}


/** 创建动画效果 */
- (void) makeAnimation : (void (^)())block
{
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:1.0];
    
    block();
    
    [UIView commitAnimations];
}

/** 平移方法 */
- (void) move : (UIButton *)button
{
    [self makeAnimation:^{
        
        // 判断平移方向
        switch (button.tag) {
            case KMoveDirTop: // 上
                
                self.imageView.transform = CGAffineTransformTranslate(self.imageView.transform, 0, -KMovingDelta);
                //                // 不能超过屏幕
                //                if (self.imageView.frame.origin.y < 0) {
                //                    CGRect tempFrame = self.imageView.frame;
                //                    tempFrame.origin.y = 0;
                //                    self.imageView.frame = tempFrame;
                //                }
                break;
            case KMoveDirLeft: // 左
                
                self.imageView.transform = CGAffineTransformTranslate(self.imageView.transform, -KMovingDelta, 0);
                //                // 不能超过屏幕
                //                if (self.imageView.frame.origin.x < 0) {
                //                    CGRect tempFrame = self.imageView.frame;
                //                    tempFrame.origin.x = 0;
                //                    self.imageView.frame = tempFrame;
                //                }
                break;
            case KMoveDirBottom: // 下
                
                self.imageView.transform = CGAffineTransformTranslate(self.imageView.transform, 0, KMovingDelta);
                //                // 不能超过屏幕
                //                if (self.imageView.frame.origin.y > (self.view.frame.size.height -KImageWidth)) {
                //                    CGRect tempFrame = self.imageView.frame;
                //                    tempFrame.origin.y = self.view.frame.size.height -KImageWidth;
                //                    self.imageView.frame = tempFrame;
                //                }
                break;
            case KMoveDirRight: // 右
                
                self.imageView.transform = CGAffineTransformTranslate(self.imageView.transform, KMovingDelta, 0);
                //                // 不能超过屏幕
                //                if (self.imageView.frame.origin.x > (self.view.frame.size.width - KImageWidth)) {
                //                    CGRect tempFrame = self.imageView.frame;
                //                    tempFrame.origin.x = self.view.frame.size.width - KImageWidth;
                //                    self.imageView.frame = tempFrame;
                //                }
                break;
        }
        
        //        // 平移到与屏幕重合则无法点击按钮 不用三目运算符则会出现一直无法点击事件
        //        self.topBtn.enabled = self.imageView.frame.origin.y ? 1 : 0;
        //        self.leftBtn.enabled = self.imageView.frame.origin.x ? 1 : 0;
        //        self.bottomBtn.enabled = self.imageView.frame.origin.y - (self.view.frame.size.height -KImageWidth) ? 1 : 0;
        //        self.rightBtn.enabled = self.imageView.frame.origin.x - (self.view.frame.size.width - KImageWidth) ? 1 : 0;
        
    }];
    
}

/** 伸缩方法 */
- (void) scale : (UIButton *)button
{
    [self makeAnimation:^{
        // 判断放大缩小
        CGFloat scale = button.tag ? 1.2 : 0.8;
        
        self.imageView.transform = CGAffineTransformScale(self.imageView.transform, scale, scale);
    }];
}

/** 旋转方法 */
- (void) rotate : (UIButton *)button
{
    [self makeAnimation:^{
        CGFloat rotate = M_PI_4 * button.tag;
        self.imageView.transform = CGAffineTransformRotate(self.imageView.transform, rotate);
    }];
    
}


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

@end

如果有人看到的话，麻烦你教教我transform不用frame如何设置不能超出屏幕，而且旋转后移动要边上图片会丢失。请指教，谢谢！！！