#在蓝懿学习iOS的日子#第七个练习日

复习这两天学习的内容

动画

//    frame  bounds  alpha  背景颜色  center  transform(转换)
    UIImageView* iv =[[UIImageView alloc]initWithFrame:CGRectMake(100, 100, 100, 100)];
    iv.image = [UIImage imageNamed:@"8.jpg"];
    [self.view addSubview:iv];
    //NO.1旋转渐变animateWithDuration（动画持续时间）
//    [UIView animateWithDuration:3 animations:^{
//        iv.center = CGPointMake(300, 300);
//        iv.alpha = .5;
//        iv.transform = CGAffineTransformScale(iv.transform, .5, .5);
//        //旋转
//        iv.transform =CGAffineTransformRotate(iv.transform, 90.0*M_PI/180);
//    }];
     //NO.2原地向左旋转  completion完成
//    [UIView animateWithDuration:3 animations:^{
//        iv.transform = CGAffineTransformRotate(iv.transform, 90.0*M_PI/180);
//    } completion:^(BOOL finished) {
//        [iv removeFromSuperview];
//    }];
    //NO.3 delay(延迟时间)
    [UIView animateWithDuration:3 delay:3 options:UIViewAnimationOptionCurveEaseIn animations:^{
        iv.center = CGPointMake(300, 300);
    } completion:^(BOOL finished) {
        [iv removeFromSuperview];
    }];

}

//旋转,左旋

number++;

CGAffineTransform rotate = CGAffineTransformMakeRotation(number / 180.0 * M_PI );

[viewDemo setTransform:rotate];

}

如果使用此方法连续点击button就可以显示处一点一点的移动效果

每次旋转90度的话可以使用一下的代码实现效果

-(void)testViewDemo

{

//旋转,右旋

number = number+90.0;

CGAffineTransform rotate = CGAffineTransformMakeRotation(number / 180.0 * M_PI );

[viewDemo setTransform:rotate];

｝

UIView实现左旋效果

//旋转,左旋

number = number-90.0;

CGAffineTransform rotate = CGAffineTransformMakeRotation(number / 180.0 * M_PI );

[viewDemo setTransform:rotate];