- (void)viewDidLoad
{
[super viewDidLoad];
self.view.backgroundColor = [UIColor whiteColor];
UIImageView* iv = [[UIImageView alloc]
initWithImage: [self drawImage:self.view.frame.size]];
[self.view addSubview:iv];
//旋转
CGAffineTransform CGAffineTransformMakeRotation ( CGFloat angle );
[UIView animateWithDuration:2.0
animations:^{
iv.transform = CGAffineTransformRotate(CGAffineTransformScale(iv.transform, 0.2, 0.2), 1*M_PI); //缩放+旋转
}];
CGAffineTransform CGAffineTransformMakeScale ( CGFloat sx, CGFloat sy );
//缩放
[UIView animateWithDuration:2.0
animations:^{
iv.transform=CGAffineTransformScale(iv.transform, 2.0, 4.0); //实现的是放大和缩小
}];
//平移
CGAffineTransform CGAffineTransformMakeTranslation ( CGFloat tx, CGFloat ty ); //平移
[UIView animateWithDuration:2.0
animations:^{
iv.transform=CGAffineTransformTranslate(iv.transform, 3, 3); //平移
}];
}
- (UIImage*) drawImage:(CGSize) size
{
// 创建内存中的图片
UIGraphicsBeginImageContext(size);
CGContextRef ctx = UIGraphicsGetCurrentContext();
// 设置线宽
CGContextSetLineWidth(ctx, 8);
// ---------下面开始向内存中绘制图形---------
// 设置线条颜色
CGContextSetRGBStrokeColor(ctx, 0 , 1, 0 , 1);
// 绘制一个矩形边框
//CGContextStrokeRect(ctx , CGRectMake(30 , 30 , 120 , 60));
// 设置填充颜色
CGContextSetRGBFillColor(ctx, 1, 1, 0 , 1);
// 绘制一个矩形边框
CGContextFillRect(ctx , CGRectMake(20 , 300, 40 , 60));
// 设置线条颜色
CGContextSetRGBStrokeColor(ctx, 0, 1 , 1 , 1);
// 获取该绘图Context中的图片
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
// ---------结束绘图---------
UIGraphicsEndImageContext();
// 获取当前应用路径下的Documents目录下的指定文件名对应的文件路径
NSString *path = [[NSHomeDirectory()
stringByAppendingPathComponent:@"Documents"]
stringByAppendingPathComponent:@"newPng.png"];
// 保存PNG图片
[UIImagePNGRepresentation(newImage)
writeToFile:path atomically:YES];
return newImage;
}
