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UIImageの合成

Last updated at Posted at 2014-10-31

ある入力フォーム(UIImage)にたいしてUILabelを貼付けたい。
UIImageとUIImageを合成するのが簡単らしい。
※UIImageViewにUILabelをaddしてもだめだった。

段階1) UIView(UILabel)のUIImage化

//! viewLabelsはclearカラー、複数のUILabelが乗っかっている
//! opaque引数をNOにすることに注意
UIGraphicsBeginImageContextWithOptions(viewLabels.bounds.size, NO, 0.0); // opaqueをNOにして背景をクリアにする
[viewLabels.layer renderInContext:UIGraphicsGetCurrentContext()];

UIImage *imageFromUIView = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

段階2) UIImageの合成

// グラフィックスコンテキストを作る
CGSize size = { _imageOriginal.size.width, _imageOriginal.size.height};
UIGraphicsBeginImageContext(size);

//元画像を描画
CGRect rect;
rect.origin = CGPointZero;
rect.size = size;
[_imageOriginal drawInRect:rect];

//重ね合わせる画像を描画
[imageFromUIView drawInRect:rect];

// 合成した画像を取得する
UIImage* compositeImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
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