從ios設備拍攝照片後可以調整圖像大小嗎？

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可能重複：
The simplest way to resize an UIImage?從ios設備拍攝照片後可以調整圖像大小嗎？

我使用iPod設備的攝像頭捕捉圖像和拍攝圖像後，我想調整它按在我的應用程序的用戶需求。但是通過在攝像頭代碼中啓用編輯：true，它僅以圖像的中間部分的矩形格式顯示圖像。提前感謝您的幫助。請注意，我希望圖像在這裏進行克隆。它意味着圖像會根據croaped圖像調整大小。

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2012-12-28 Arun

你必須導入兩個類，即UIImage Resize.h和.m文件.....這些文件對調整圖片大小非常有幫助 –

好的。但是你能詳細告訴我添加這些文件嗎？我的意思是我必須爲此導入什麼框架或文件。感謝您的快速回復。 – Arun

你也可以嘗試這個鏈接可能會幫助你..... http://stackoverflow.com/questions/2658738/the-simplest-way-to-resize-an-uiimage –

這可能會幫助你

- (UIImage*)imageByScalingAndCroppingForSize:(CGSize)targetSize AndImage:(UIImage*)sourceImage 
{ 
UIImage *newImage = nil;   
CGSize imageSize = sourceImage.size; 
CGFloat width = imageSize.width; 
CGFloat height = imageSize.height; 
CGFloat targetWidth = targetSize.width; 
CGFloat targetHeight = targetSize.height; 
CGFloat scaleFactor = 0.0; 
CGFloat scaledWidth = targetWidth; 
CGFloat scaledHeight = targetHeight; 
CGPoint thumbnailPoint = CGPointMake(0.0,0.0); 

if (CGSizeEqualToSize(imageSize, targetSize) == NO) 
{ 
    CGFloat widthFactor = targetWidth/width; 
    CGFloat heightFactor = targetHeight/height; 

    if (widthFactor > heightFactor) 
     scaleFactor = widthFactor; // scale to fit height 
    else 
     scaleFactor = heightFactor; // scale to fit width. 

    scaledWidth = width * scaleFactor; 
    scaledHeight = height * scaleFactor; 

    // center the image 
    if (widthFactor > heightFactor) 
    { 
     thumbnailPoint.y = (targetHeight - scaledHeight) * 0.5; 
    } 
    else 
     if (widthFactor < heightFactor) 
     { 
      thumbnailPoint.x = (targetWidth - scaledWidth) * 0.5; 
     } 
}  

UIGraphicsBeginImageContext(targetSize); // this will crop 

CGRect thumbnailRect = CGRectZero; 
thumbnailRect.origin = thumbnailPoint; 
thumbnailRect.size.width = scaledWidth; 
thumbnailRect.size.height = scaledHeight; 

[sourceImage drawInRect:thumbnailRect]; 

newImage = UIGraphicsGetImageFromCurrentImageContext(); 
if(newImage == nil) 
NSLog(@"could not scale image"); 

//pop the context to get back to the default 
UIGraphicsEndImageContext(); 
return newImage; 
}

來源

2012-12-28 07:31:36 SachinVsSachin

在這裏你可以做來調整圖像。

UIImage* resizedImage(UIImage *inImage, CGRect thumbRect) 
{ 
CGImageRef   imageRef = [inImage CGImage]; 
CGImageAlphaInfo alphaInfo = CGImageGetAlphaInfo(imageRef); 

// There's a wierdness with kCGImageAlphaNone and CGBitmapContextCreate 
// see Supported Pixel Formats in the Quartz 2D Programming Guide 
// Creating a Bitmap Graphics Context section 
// only RGB 8 bit images with alpha of kCGImageAlphaNoneSkipFirst, kCGImageAlphaNoneSkipLast, kCGImageAlphaPremultipliedFirst, 
// and kCGImageAlphaPremultipliedLast, with a few other oddball image kinds are supported 
// The images on input here are likely to be png or jpeg files 
if (alphaInfo == kCGImageAlphaNone) 
    alphaInfo = kCGImageAlphaNoneSkipLast; 

// Build a bitmap context that's the size of the thumbRect 
CGContextRef bitmap = CGBitmapContextCreate(
      NULL, 
      thumbRect.size.width,  // width 
      thumbRect.size.height,  // height 
      CGImageGetBitsPerComponent(imageRef), // really needs to always be 8 
      4 * thumbRect.size.width, // rowbytes 
      CGImageGetColorSpace(imageRef), 
      alphaInfo 
    ); 

// Draw into the context, this scales the image 
CGContextDrawImage(bitmap, thumbRect, imageRef); 

// Get an image from the context and a UIImage 
CGImageRef ref = CGBitmapContextCreateImage(bitmap); 
UIImage* result = [UIImage imageWithCGImage:ref]; 

CGContextRelease(bitmap); // ok if NULL 
CGImageRelease(ref); 

return result;

}

希望，它會幫助你。

來源

2012-12-28 07:32:07 josh

從ios設備拍攝照片後可以調整圖像大小嗎？

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