我有一个名为ShadowView的UIImageView子类,它显示可以在任何东西下使用的阴影。 ShadowViews将从笔尖加载。
在initWithCoder:中,我有以下代码:
- (id)initWithCoder:(NSCoder *)decoder { self = [super initWithCoder:decoder]; if (self != nil) { UIImage *shadowImage = [[UIImage imageNamed:@"drop_shadow_4_pix.png"] stretchableImageWithLeftCapWidth:4 topCapHeight:4]; [self setContentMode:UIViewContentModeScaleToFill]; [self setImage:shadowImage]; } return self; }但是,当我运行应用程序时,此图像不会出现。
但是,如果我改变它
... UIImage *shadowImage = [UIImage imageNamed:@"drop_shadow_4_pix.png"]; ...它工作正常,但它被拉错了。
有关为什么会发生这种情况的任何想法?
编辑:当我以编程方式加载shadowview时,使用initWithFrame:与initWithCoder类似地实现:
另一个编辑:我想我解决了这个问题。 我需要设置自动调整遮罩。
I have a UIImageView subclass called ShadowView, which displays a shadow that can be used under anything. ShadowViews are to be loaded from a nib.
In initWithCoder:, I have the following code:
- (id)initWithCoder:(NSCoder *)decoder { self = [super initWithCoder:decoder]; if (self != nil) { UIImage *shadowImage = [[UIImage imageNamed:@"drop_shadow_4_pix.png"] stretchableImageWithLeftCapWidth:4 topCapHeight:4]; [self setContentMode:UIViewContentModeScaleToFill]; [self setImage:shadowImage]; } return self; }When I run the app, though, this image does not appear.
But if I change it to
... UIImage *shadowImage = [UIImage imageNamed:@"drop_shadow_4_pix.png"]; ...it works fine, but it is stretched wrong.
Any ideas as to why this is happening?
Edit: it is the same when I load the shadowview programmatically, with initWithFrame: implemented similarly to initWithCoder:.
Another Edit: I think I solved the problem. I needed to set the autoresizing masks.
最满意答案
shadowImage是否为零?
UIImage *shadowImage = [[UIImage imageNamed:@"drop_shadow_4_pix.png"] stretchableImageWithLeftCapWidth:4 topCapHeight:4];如果基本图像小于5像素宽或5像素高,则该方法可以返回nil,因为它需要4个像素用于大写字母+ 1个像素来拉伸。
Is shadowImage nil?
UIImage *shadowImage = [[UIImage imageNamed:@"drop_shadow_4_pix.png"] stretchableImageWithLeftCapWidth:4 topCapHeight:4];That method could return nil if the base image is less than 5 pixels wide or 5 pixels tall since it needs the 4 pixels for the caps + 1 pixel to stretch.
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