UILabel中的文本可以有colorWithPatternImage：分配给它吗？ [英] Can text in UILabel have a colorWithPatternImage: assigned to it?

问题描述

如果是这样，图像可以动画吗？

If so, can the image be animated?

有充分的理由不这样做吗？内存使用情况等？

Is there a good reason not to do this? Memory usage, etc?

推荐答案

是的，标签可以有图案颜色。

Yes, a label can have a pattern color.

替代文字http://img178.imageshack.us /img178/1995/textwithpatterncolor.png

// make a UIColor with an image as the pattern
UIImage *tileImage = [UIImage imageNamed:@"hot_grad_64px.png"];
UIColor *patternColorTile = [UIColor colorWithPatternImage:tileImage];

// assign it to the .textColor property of a UILabel
self.testLabel.textColor = patternColorTile;

// the pattern will only align if both the .frame property of the 
// label AND the font size is the same as the image tile height

可以通过在多种图案颜色之间切换来设置图案的动画效果。我已经在> 30fps的图案图像和普通颜色之间翻转，并且iPhone设备保持良好状态。

The pattern can be animated by switching between multiple pattern colors. I have flipped between a pattern image and a plain color at > 30fps and the iPhone device kept up fine.

只要图像图块很小，我就不会看到任何不这样做的理由，但我没有广泛地描述它。

As long as the image tile is small, I don't see any reason not to do this, but I haven't extensively profiled it.

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