#pragma mark 储存图片
- (void)saveImage:(UIImage *)image
{
//1) 储存到app的文件里,以image.png为名存到app home底下的Documents目录里
// 将照片保存到沙盒Documents目录中
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
// 保存照片的路径＋名称：../Documents/image
NSString *filePath = [[paths objectAtIndex:0] stringByAppendingPathComponent:[NSString stringWithFormat:@"image.png"]];
filePath = [[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"]stringByAppendingPathComponent:@"image.png"];// 方式二获取地址
[UIImagePNGRepresentation(image) writeToFile:filePath atomically:YES]; // 保存成功会返回YES
//2)储存到手机的图片库里
UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);
}
#pragma mark 等比率缩放
- (UIImage *)scaleImage:(UIImage *)image toScale:(float)scaleSize
{
UIGraphicsBeginImageContext(CGSizeMake(image.size.width * scaleSize, image.size.height * scaleSize));// 创建新的图片并制定大小
[image drawInRect:CGRectMake(0, 0, image.size.width * scaleSize, image.size.height * scaleSize)];// 缩放画图
UIImage *scaledImage = UIGraphicsGetImageFromCurrentImageContext();//获取图片
UIGraphicsEndImageContext();// 关闭图形上下文
return scaledImage;
}
#pragma mark 自定长宽
- (UIImage *)reSizeImage:(UIImage *)image toSize:(CGSize)reSize
{
UIGraphicsBeginImageContext(reSize);
[image drawInRect:CGRectMake(0, 0, reSize.width, reSize.height)];
UIImage *reSizeImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return reSizeImage;
}
#pragma mark 根据给定得图片，从其指定区域截取一张新得图片
-(UIImage *)getImageFromImage:(UIImage *)image rect:(CGRect)rect
{
CGImageRef imageRef = image.CGImage;
CGImageRef subImageRef = CGImageCreateWithImageInRect(imageRef, rect);
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextDrawImage(context, rect, subImageRef);
UIImage* smallImage = [UIImage imageWithCGImage:subImageRef];
UIGraphicsEndImageContext();
return smallImage;
}
#pragma mark UIView转UIImage
- (UIImage *)createImageFromView:(UIView *)view
{
CGFloat scale = [UIScreen mainScreen].scale;// 屏幕密度
// 开始绘图，参数1:区域大小;参数2:是否是非透明的(如果需要显示半透明效果，需要传NO，否则传YES);参数3:屏幕密度
UIGraphicsBeginImageContextWithOptions(view.bounds.size, YES, scale);
[view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();// 生成图片
UIGraphicsEndImageContext();// 关闭绘画通道
return image;
}