問題1摩窃、最近一直在開發(fā)swift項目，遇到一個問題芬骄，就是我們項目的導(dǎo)航欄文字是白色猾愿，當(dāng)我們present進(jìn)入相冊中時， 會發(fā)現(xiàn)相冊導(dǎo)航欄的文字顏色也是白色账阻， 無法看到蒂秘。解決這個問題，只需要我們在加載UIImagePickerController淘太，對相冊導(dǎo)航欄進(jìn)行設(shè)置即可：
fileprivate lazy var imagePicker : UIImagePickerController = {
let imgPicker = UIImagePickerController()
// 允許編輯
imgPicker.allowsEditing = true
// 導(dǎo)航欄字體顏色
imgPicker.navigationBar.tintColor = UIColor.black
let dict:NSDictionary = [NSAttributedStringKey.foregroundColor: UIColor.black,NSAttributedStringKey.font : UIFont.boldSystemFont(ofSize: 18)]
//標(biāo)題設(shè)置顏色與字體大小
imgPicker.navigationBar.titleTextAttributes = dict as? [NSAttributedStringKey : AnyObject]
//設(shè)置代理姻僧，檢測操作
imgPicker.delegate = self as UIImagePickerControllerDelegate & UINavigationControllerDelegate
return imgPicker
}()
問題2规丽、解決拍照自動旋轉(zhuǎn)90度問題
OC版本代碼：
- (UIImage *)fixOrientation:(UIImage *)aImage {
// No-op if the orientation is already correct
if (aImage.imageOrientation == UIImageOrientationUp)
return aImage;
// We need to calculate the proper transformation to make the image upright.
// We do it in 2 steps: Rotate if Left/Right/Down, and then flip if Mirrored.
CGAffineTransform transform = CGAffineTransformIdentity;
switch (aImage.imageOrientation) {
case UIImageOrientationDown:
case UIImageOrientationDownMirrored:
transform = CGAffineTransformTranslate(transform, aImage.size.width, aImage.size.height);
transform = CGAffineTransformRotate(transform, M_PI);
break;
case UIImageOrientationLeft:
case UIImageOrientationLeftMirrored:
transform = CGAffineTransformTranslate(transform, aImage.size.width, 0);
transform = CGAffineTransformRotate(transform, M_PI_2);
break;
case UIImageOrientationRight:
case UIImageOrientationRightMirrored:
transform = CGAffineTransformTranslate(transform, 0, aImage.size.height);
transform = CGAffineTransformRotate(transform, -M_PI_2);
break;
default:
break;
}
switch (aImage.imageOrientation) {
case UIImageOrientationUpMirrored:
case UIImageOrientationDownMirrored:
transform = CGAffineTransformTranslate(transform, aImage.size.width, 0);
transform = CGAffineTransformScale(transform, -1, 1);
break;
case UIImageOrientationLeftMirrored:
case UIImageOrientationRightMirrored:
transform = CGAffineTransformTranslate(transform, aImage.size.height, 0);
transform = CGAffineTransformScale(transform, -1, 1);
break;
default:
break;
}
// Now we draw the underlying CGImage into a new context, applying the transform
// calculated above.
CGContextRef ctx = CGBitmapContextCreate(NULL, aImage.size.width, aImage.size.height,
CGImageGetBitsPerComponent(aImage.CGImage), 0,
CGImageGetColorSpace(aImage.CGImage),
CGImageGetBitmapInfo(aImage.CGImage));
CGContextConcatCTM(ctx, transform);
switch (aImage.imageOrientation) {
case UIImageOrientationLeft:
case UIImageOrientationLeftMirrored:
case UIImageOrientationRight:
case UIImageOrientationRightMirrored:
// Grr...
CGContextDrawImage(ctx, CGRectMake(0,0,aImage.size.height,aImage.size.width), aImage.CGImage);
break;
default:
CGContextDrawImage(ctx, CGRectMake(0,0,aImage.size.width,aImage.size.height), aImage.CGImage);
break;
}
// And now we just create a new UIImage from the drawing context
CGImageRef cgimg = CGBitmapContextCreateImage(ctx);
UIImage *img = [UIImage imageWithCGImage:cgimg];
CGContextRelease(ctx);
CGImageRelease(cgimg);
return img;
}
Swift版本代碼：
/// 解決拍照自動旋轉(zhuǎn)90度問題
///
/// - Parameter aImage: <#aImage description#>
public final func fixOrientation(aImage: UIImage) -> UIImage {
// 取向正確，則不操作
if aImage.imageOrientation == UIImageOrientation.up {
return aImage
}
//通過合理的計算使用正確的取向圖片
//我們用2步驟:如果左/右/向下旋轉(zhuǎn),然后讓鏡像翻轉(zhuǎn)
var transform = CGAffineTransform.identity
switch aImage.imageOrientation {
case .down, .downMirrored:
transform = transform.translatedBy(x: aImage.size.width, y: aImage.size.height)
transform = transform.rotated(by: .pi)
case .left, .leftMirrored:
transform = transform.translatedBy(x: aImage.size.width, y: 0)
transform = transform.rotated(by: .pi / 2)
case .right, .rightMirrored:
transform = transform.translatedBy(x: 0, y: aImage.size.height)
transform = transform.rotated(by: -.pi / 2)
default:break
}
switch aImage.imageOrientation {
case .upMirrored, .downMirrored:
transform = transform.translatedBy(x: aImage.size.width, y: 0)
transform = transform.scaledBy(x: -1, y: 1)
case .leftMirrored, .rightMirrored:
transform = transform.translatedBy(x: aImage.size.height, y: 0)
transform = transform.scaledBy(x: -1, y: 1)
default:break
}
let ctx = CGContext(data: nil, width: Int(aImage.size.width), height: Int(aImage.size.height), bitsPerComponent: aImage.cgImage!.bitsPerComponent, bytesPerRow: 0, space: aImage.cgImage!.colorSpace!, bitmapInfo: aImage.cgImage!.bitmapInfo.rawValue)
ctx?.concatenate(transform)
switch aImage.imageOrientation {
case .left, .leftMirrored, .right, .rightMirrored:
ctx?.draw(aImage.cgImage!, in: CGRect(x: CGFloat(0), y: CGFloat(0), width: CGFloat(size.height), height: CGFloat(size.width)))
default:
ctx?.draw(aImage.cgImage!, in: CGRect(x: CGFloat(0), y: CGFloat(0), width: CGFloat(size.width), height: CGFloat(size.height)))
}
let cgimg: CGImage = (ctx?.makeImage())!
let img = UIImage(cgImage: cgimg)
return img
}
