// 尺寸变换
-
(UIImage *)reSizeImage:(UIImage *)image toSize:(CGSize)reSize {
// 创建图形要变化的大小的上下文
UIGraphicsBeginImageContext(CGSizeMake(reSize.width, reSize.height));
// 绘制图形的位置和大小
[image drawInRect:CGRectMake(0, 0, reSize.width, reSize.height)];
// 图形获取图片从当前图片的上下文
UIImage *reSizeImage = UIGraphicsGetImageFromCurrentImageContext();
// 结束图形绘制
UIGraphicsEndImageContext();return reSizeImage;
}
// 等比率缩放
- (UIImage *)scaleImage:(UIImage *)image toScale:(float)scaleSize{
UIGraphicsBeginImageContext(CGSizeMake(image.size.width * scaleSize, image.size.height * scaleSize));
[image drawInRect:CGRectMake(0, 0, image.size.width * scaleSize, image.size.height * scaleSize)];
UIImage *scaledImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return scaledImage;
}
// 截图
-
(UIImage *)captureView:(UIView *)view {
// 获得截图view的fram
CGRect rect = view.frame;
// 图形开始图片的上下文
UIGraphicsBeginImageContext(rect.size);
// 获得当前上下文
CGContextRef context = UIGraphicsGetCurrentContext();
// 呈现图形当前的上下文到目标view的layer层中
[view.layer renderInContext:context];UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return img;
}
// 储存图片， 这里分为储存在app的文件里和储存到手机的图库里
// 1.储存到app的文件里
- (void)saveImageToAppFileWithImage:(UIImage *)image path:(NSString *)path{
//把要处理的图片, 以image.png名称存到app home下的Documents目录里
// NSString *pathStr = [[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"]stringByAppendingPathComponent:@"image.png"];
[UIImagePNGRepresentation(image) writeToFile:path atomically:YES];
}
// 2.储存图片到手机相册中（必须真机使用，模拟器无法使用）
-
(void)saveImageToPhotoAlbum:(UIImage*)savedImage {
UIImageWriteToSavedPhotosAlbum(savedImage, self, @selector(image:didFinishSavingWithError:contextInfo:), NULL);
}
// 保存图片成功与否的提示
- (void)image: (UIImage *) image didFinishSavingWithError: (NSError *) error contextInfo: (void *) contextInfo
{
NSString *msg = nil ;
if(error != NULL){
msg = @"保存图片失败" ;
}else{
msg = @"保存图片成功" ;
}
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"保存图片结果提示"
message:msg
delegate:self
cancelButtonTitle:@"确定"
otherButtonTitles:nil];
[alert show];
}
