访问相册摄像头保存图片至相册以及图片加水印
#pragma mark - 访问相册摄像头 ----------------------------访问相册摄像头---------------------------
在ViewController.h中：
@interface ViewController : UIViewController<UIImagePickerControllerDelegate, UINavigationControllerDelegate>
@property (nonatomic, retain) UIImagePickerController *imagePicker;
@property(nonatomic,retain)UIImageView* imageview1;
@end
在ViewController.m中：
//----------1 从网络加载图片
imageview1 = [[UIImageView alloc]initWithFrame:CGRectMake(10, 50, 300, 200)];
imageview1.backgroundColor = [UIColor yellowColor];
[self.view addSubview:imageview1];
NSURL* url = [[NSURL alloc]initWithString:@"https://www.google.com.hk/images/srpr/logo11w.png"];
NSData* data = [NSData dataWithContentsOfURL:url];
//把data转成image
UIImage* image = [UIImage imageWithData:data];
//显示图片
imageview1.image = image;
//把图片转化为数据
NSData* imagedata = UIImageJPEGRepresentation(image, 1);
NSLog(@"%d",imagedata.length);
//保存到相册里面，这个可以到模拟器里的相册产查看的。
UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:), NULL);
//---------2 相册的访问
UIButton *buttonphoto = [UIButton buttonWithType:UIButtonTypeRoundedRect];
buttonphoto.tag = 100;
buttonphoto.frame = CGRectMake(50, 250, 80, 50);
[buttonphoto setTitle:@"访问相册" forState:UIControlStateNormal];
[buttonphoto addTarget:self action:@selector(look:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:buttonphoto];
//---------3 摄像头的访问
UIButton *buttoncamera = [UIButton buttonWithType:UIButtonTypeRoundedRect];
buttoncamera.tag = 200;
buttoncamera.frame = CGRectMake(50, 310, 80, 50);
[buttoncamera setTitle:@"访问摄像头" forState:UIControlStateNormal];
[buttoncamera addTarget:self action:@selector(look:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:buttoncamera];
// 访问相册以及摄像头
-(void)look:(UIButton*)button
{
if (button.tag == 100) {
imagepicker = [[UIImagePickerController alloc]init];
imagepicker.delegate = self;
//访问相册类型的类型
//UIImagePickerControllerSourceTypePhotoLibrary,
//UIImagePickerControllerSourceTypeCamera, ===== 访问摄像头
//UIImagePickerControllerSourceTypeSavedPhotosAlbum ======= 只能访问第一列的图片
imagepicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
//以摩擦动画的方式显示
[self presentViewController:imagepicker animated:YES completion:^{
}];
}else {
//注意摄像头的访问需要在真机上进行
//UIImagePickerControllerCameraDeviceFront === 前摄像头
//UIImagePickerControllerCameraDeviceRear === 后摄像头
BOOL isCamrma = [UIImagePickerController isCameraDeviceAvailable:UIImagePickerControllerCameraDeviceRear];
if (!isCamrma) {
NSLog(@"没有摄像头");
return;
}
//摄像头
imagepicker.sourceType = UIImagePickerControllerSourceTypeCamera;
//允许编辑
imagepicker.allowsEditing =YES;
}
}
//---------2 相册的访问
//相册选中之后调用
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
//UIImagePickerControllerOriginalImage === 取原始图片
//UIImagePickerControllerEditedImage === 去编辑以后的图片
UIImage* image = [info objectForKey:UIImagePickerControllerEditedImage];
imageview1.image = image;
NSLog(@"info = %@",info);
[picker dismissViewControllerAnimated:YES completion:nil];
}
//取消按钮的点击事件
-(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
[picker dismissViewControllerAnimated:YES completion:NULL];
}
//将图片保存
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo
{
NSLog(@"error = %@",error);
}
#pragma mark - 图片加水印 ----------------------------图片加水印---------------------------
1.加文字
- (UIImage *)imageWithLogoText:(UIImage *)img text:(NSString *)text1
{
/////注：此为后来更改，用于显示中文。zyq,2013-5-8
CGSize size = CGSizeMake(200, img.size.height); //设置上下文（画布）大小
UIGraphicsBeginImageContext(size); //创建一个基于位图的上下文(context)，并将其设置为当前上下文
CGContextRef contextRef = UIGraphicsGetCurrentContext(); //获取当前上下文
CGContextTranslateCTM(contextRef, 0, img.size.height); //画布的高度
CGContextScaleCTM(contextRef, 1.0, -1.0); //画布翻转
CGContextDrawImage(contextRef, CGRectMake(0, 0, img.size.width, img.size.height), [img CGImage]); //在上下文种画当前图片
[[UIColor redColor] set]; //上下文种的文字属性
CGContextTranslateCTM(contextRef, 0, img.size.height);
CGContextScaleCTM(contextRef, 1.0, -1.0);
UIFont *font = [UIFont boldSystemFontOfSize:16];
[text1 drawInRect:CGRectMake(0, 0, 200, 80) withFont:font]; //此处设置文字显示的位置
UIImage *targetimg =UIGraphicsGetImageFromCurrentImageContext(); //从当前上下文种获取图片
UIGraphicsEndImageContext(); //移除栈顶的基于当前位图的图形上下文。
return targetimg;
//注：此为原来，不能显示中文。无用。
//get image width and height
int w = img.size.width;
int h = img.size.height;
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
//create a graphic context with CGBitmapContextCreate
CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, 4 * w, colorSpace, kCGImageAlphaPremultipliedFirst);
CGContextDrawImage(context, CGRectMake(0, 0, w, h), img.CGImage);
CGContextSetRGBFillColor(context, 0.0, 1.0, 1.0, 1);
char* text = (char *)[text1 cStringUsingEncoding:NSUnicodeStringEncoding];
CGContextSelectFont(context, "Georgia", 30, kCGEncodingMacRoman);
CGContextSetTextDrawingMode(context, kCGTextFill);
CGContextSetRGBFillColor(context, 255, 0, 0, 1);
CGContextShowTextAtPoint(context, w/2-strlen(text)*5, h/2, text, strlen(text));
//Create image ref from the context
CGImageRef imageMasked = CGBitmapContextCreateImage(context);
CGContextRelease(context);
CGColorSpaceRelease(colorSpace);
return [UIImage imageWithCGImage:imageMasked];
}
2.新的添加文字水印的方法一
- (UIImage *) imageWithStringWaterMark:(NSString *)markString inRect:(CGRect)rect color:(UIColor *)color font:(UIFont *)font
{
#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 40000
if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 4.0)
{
UIGraphicsBeginImageContextWithOptions([self size], NO, 0.0); // 0.0 for scale means "scale for device's main screen".
}
#else
if ([[[UIDevice currentDevice] systemVersion] floatValue] < 4.0)
{
UIGraphicsBeginImageContext([self size]);
}
#endif
//原图
[self drawInRect:CGRectMake(0, 0, self.size.width, self.size.height)];
//文字颜色
[color set];
//水印文字
[markString drawInRect:rect withFont:font];
UIImage *newPic = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newPic;
}
3.还是添加文字水印方法二
- (UIImage *) imageWithStringWaterMark:(NSString *)markString atPoint:(CGPoint)point color:(UIColor *)color font:(UIFont *)font
{
#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 40000
if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 4.0)
{
UIGraphicsBeginImageContextWithOptions([self size], NO, 0.0); // 0.0 for scale means "scale for device's main screen".
}
#else
if ([[[UIDevice currentDevice] systemVersion] floatValue] < 4.0)
{
UIGraphicsBeginImageContext([self size]);
}
#endif
//原图
[self drawInRect:CGRectMake(0, 0, self.size.width, self.size.height)];
//文字颜色
[color set];
//水印文字
[markString drawAtPoint:point withFont:font];
UIImage *newPic = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newPic;
}
4.加图片
-(UIImage *)imageWithLogoImage:(UIImage *)img logo:(UIImage *)logo
{
//get image width and height
int w = img.size.width;
int h = img.size.height;
int logoWidth = logo.size.width;
int logoHeight = logo.size.height;
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
//create a graphic context with CGBitmapContextCreate
CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, 4 * w, colorSpace, kCGImageAlphaPremultipliedFirst);
CGContextDrawImage(context, CGRectMake(0, 0, w, h), img.CGImage);
CGContextDrawImage(context, CGRectMake(w-logoWidth, 0, logoWidth, logoHeight), [logo CGImage]);
CGImageRef imageMasked = CGBitmapContextCreateImage(context);
CGContextRelease(context);
CGColorSpaceRelease(colorSpace);
return [UIImage imageWithCGImage:imageMasked];
// CGContextDrawImage(contextRef, CGRectMake(100, 50, 200, 80), [smallImg CGImage]);
}
5.新的添加图片水印的方法
- (UIImage *) imageWithWaterMask:(UIImage*)mask inRect:(CGRect)rect
{
#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 40000
if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 4.0)
{
UIGraphicsBeginImageContextWithOptions([self size], NO, 0.0); // 0.0 for scale means "scale for device's main screen".
}
#else
if ([[[UIDevice currentDevice] systemVersion] floatValue] < 4.0)
{
UIGraphicsBeginImageContext([self size]);
}
#endif
//原图
[self drawInRect:CGRectMake(0, 0, self.size.width, self.size.height)];
//水印图
[mask drawInRect:rect];
UIImage *newPic = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newPic;
}
6 .加半透明的水印
//加半透明的水印
-(UIImage *)imageWithTransImage:(UIImage *)useImage addtransparentImage:(UIImage *)transparentimg
{
UIGraphicsBeginImageContext(useImage.size);
[useImage drawInRect:CGRectMake(0, 0, useImage.size.width, useImage.size.height)];
[transparentimg drawInRect:CGRectMake(0, useImage.size.height-transparentimg.size.height, transparentimg.size.width, transparentimg.size.height) blendMode:kCGBlendModeOverlay alpha:0.4f];
UIImage *resultingImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return resultingImage;
}