- (void)viewDidLoad {

[super viewDidLoad];

//自转

_view1= [[UIView alloc] initWithFrame:CGRectMake(100, 100, 100, 100)];

_view1.backgroundColor= [UIColor orangeColor];

_view1.layer.cornerRadius= 30;

[self.view addSubview:_view1];

//等比例缩放

//两个参数分别表示,宽度和高度缩放的倍数

_view1.transform=CGAffineTransformMakeScale(0.5, 0.5);

//连续转动

[NSTimer scheduledTimerWithTimeInterval:0.05 target:self selector:@selector(rotation) userInfo:nil repeats:YES];

}

- (void)rotation {

static float angle;

angle += 0.1;

//transform转换

//CGAffineTransformMakeRotation(<#CGFloat angle#>)旋转角度Rotation旋转

//角度为正时,向顺时针方向转动(圆周运动与之相反)

//0.785==45°==M_PI_4

_view1.transform=CGAffineTransformMakeRotation(angle);

//transform属性转换的相对状态是初始状态

}