<span style="font-family:Verdana;"><span style="font-family:Microsoft YaHei;"><span style="font-family:Microsoft YaHei;">#import "ViewController.h"

@interface ViewController ()

@property (weak, nonatomic) IBOutlet UIButton *moving;

- (IBAction)move;

- (IBAction)rotate;

- (IBAction)scale;

- (IBAction)goback;

@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)move {
    
    // 2.修改結構體值
    // 下面這句話的意思是：告訴控制元件，要平移到距離原始位置-50的位置
//    self.moving.transform = CGAffineTransformMakeTranslation(0, 50); // 向上平移
    
    // 基於一箇舊的值，再進行平移
    // 基於一個現有的值，再進行平移
    self.moving.transform = CGAffineTransformTranslate(self.moving.transform, 0, 50);
}

- (IBAction)rotate {
    //45°
//    self.moving.transform = CGAffineTransformMakeRotation(M_PI_4);
    self.moving.transform = CGAffineTransformRotate(self.moving.transform, M_PI_4);
}

- (IBAction)scale {
//    self.moving.transform = CGAffineTransformMakeScale(0.5, 0.5);
    
    [UIView animateWithDuration:2.5 animations:^{
        self.moving.transform = CGAffineTransformTranslate(self.moving.transform, 0, 50);
        self.moving.transform = CGAffineTransformRotate(self.moving.transform, M_PI_4);
        self.moving.transform = CGAffineTransformScale(self.moving.transform, 1.5, 1.5);
    }];
}

//讓控制元件回到原來的位置
- (IBAction)goback {
    self.moving.transform = CGAffineTransformIdentity;
}
@end
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