图片使用

- (void)cutMapView:(UIView *)theView

{

//************** 得到图片 *******************

CGRect rect = theView.frame;  //截取图片大小

//开始取图，参数：截图图片大小

UIGraphicsBeginImageContext(rect.size);

//截图层放入上下文中

[theView.layer renderInContext:UIGraphicsGetCurrentContext()];

//从上下文中获得图片

UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

//结束截图

UIGraphicsEndImageContext();

//************** 存图片 *******************

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);

NSString *filePath = [[paths objectAtIndex:0] stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.png",@"jietu"]];   // 保存文件的名称

NSLog(@"filePath = %@",filePath);

//UIImagePNGRepresentation方法将image对象转为NSData对象

//写入文件中

BOOL result = [UIImagePNGRepresentation(image)writeToFile: filePath atomically:YES];

NSLog(@"result = %d",result);

//*************** 截取小图 ******************

CGRect rect1 = CGRectMake(90, 0, 82, 82);//创建矩形框

//对图片进行截取

UIImage * image2 = [UIImage imageWithCGImage:CGImageCreateWithImageInRect([image CGImage], rect1)];

NSString *filePath2 = [[paths objectAtIndex:0] stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.png",@"jietu2"]];   // 保存文件的名称

NSLog(@"filePath = %@",filePath);

BOOL result2 = [UIImagePNGRepresentation(image2)writeToFile:filePath2 atomically:YES];

NSLog(@"result2 = %d",result2);

//存入相册

//UIImageWriteToSavedPhotosAlbum(viewImage, nil, nil, nil);

}