[英]UIImagePickerController imagePicker not fitting to iPhone 4 Screen
我讓用戶使用UIImagePickerControllerSourceTypePhotoLibrary選擇圖像。
然后,我可以使用以下方法來獲取編輯后的圖像,應用疊加層,然后將其傳遞給我的PostPictureViewController進行顯示。 在顯示時,我希望圖像保持其原始的寬高比並適合屏幕。
在使用4.3 sdk的模擬器上,它可以正常工作,但是當我將其放在iPhone 4視網膜顯示屏上時,圖像被縮放到左上角,而全屏顯示的圖像只有1/4,而沒有原始的寬高比。 !
我如何縮小它以適合屏幕,就像它在模擬器上一樣?
我也嘗試過完全消除覆蓋,只返回原始圖像和編輯后的圖像進行顯示,但是即使那樣也不能保持其原始縱橫比!
- (void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
// Access the cropped image from info dictionary
image = [info objectForKey:@"UIImagePickerControllerEditedImage"];
// Combine image with overlay before saving!!
image = [self addOverlayToImage:image];
overlayGraphicView.image = nil;
// Take the picture image to the post picture view controller
postPictureView = [[PostPictureViewController alloc] init:image];
[picker pushViewController:postPictureView animated:YES];
[picker release],picker = nil;
}
這是我的添加疊加圖像功能:
- (UIImage*) addOverlayToImage:(UIImage*)originalImage
{
//CGRect cgRect =[[UIScreen mainScreen] bounds];
CGSize size = originalImage.size;
if (UIGraphicsBeginImageContextWithOptions != NULL) {
// Use for iPhone 4 Retina
UIGraphicsBeginImageContextWithOptions(size, YES, 0.0);
} else {
UIGraphicsBeginImageContext(size);
}
UIImage* overlayImage = [UIImage imageNamed:overlayGraphicName];
[originalImage drawAtPoint:CGPointMake(0,0)];
[(UIImage *)overlayImage drawAtPoint:CGPointMake(0,(originalImage.size.height/2 - overlayImage.size.height/2) + 20)];
UIImage *finalImage = UIGraphicsGetImageFromCurrentImageContext();
[finalImage retain];
UIGraphicsEndImageContext();
return finalImage;
}
最后在我的PostPictureViewController中,我在viewdidload中顯示圖像:
- (void)viewDidLoad
{
[super viewDidLoad];
[self.view setBackgroundColor:[UIColor blackColor]];
// Load the picker image for viewing
UIImageView *pickerView = [[UIImageView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 320, 480)];
[pickerView setImage:pickerImage];
pickerView.contentMode = UIViewContentModeScaleAspectFit;
[self.view addSubview:pickerView];
[pickerView release],pickerView=nil;
}
在此用於顯示圖像的viewdidload方法中,如果我這樣做:
UIImageView *pickerView = [[UIImageView alloc] initWithImage:pickerImage];
則圖像不會在模擬器上垂直居中放置在屏幕上,而是從0,0開始,在此實際上使用CGRectMake定義幀的寬度和高度在屏幕上居中。
顯然,對於iPhone 4,我也嘗試更改此設置:
UIImageView *pickerView = [[UIImageView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 640, 960)];
但是圖像仍然會放大到比屏幕更大和更大!
您可以在界面構建器中將imageview的屬性設置為Aspectfit。這會有所幫助。或者通過編程,您可以使用imageView.contentMode = UIViewContentModeScaleAspectFit;
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