iphone图片拉伸相关

灰太狼 2021-11-23 05:04 335阅读 0赞

关于让图片在指定位置拉伸，有一个函数

\- (UIImage \*)stretchableImageWithLeftCapWidth:(NSInteger)leftCapWidth topCapHeight:(NSInteger)topCapHeight

（支持ios2--ios4）

这个函数是UIImage的一个实例函数，它的功能是创建一个内容可拉伸，而边角不拉伸的图片，需要两个参数，第一个是左边不拉伸区域的宽度，第二个参数是上面不拉伸的高度。根据设置的宽度和高度，将接下来的一个像素进行左右扩展和上下拉伸。

注意：可拉伸的范围都是距离leftCapWidth后的1竖排像素，和距离topCapHeight后的1横排像素。

以上函数在apple官方文档中定义为（Deprecated in iOS 5.0），虽经验证在5.0.1上可以使用并不报错，不过推荐在IOS5上使用以下函数：

\- (UIImage \*)resizableImageWithCapInsets:(UIEdgeInsets)*capInsets*

（仅支持ios5）

**相关代码：**

UIImage \*bg = \[\[UIImage imageNamed:@"camera.png"\]stretchableImageWithLeftCapWidth:30 topCapHeight:0\];

UIImageView \*bgView = \[\[UIImageView alloc\] initWithImage:bg\];

bgView.frame = CGRectMake(100, 200, 160, 60);

\[self.view addSubview:bgView\];

\[bg release\];

\[bgView release\];

UIImage \*bg = \[[\[UIImageimageNamed:@"camera.png"\]][UIImageimageNamed_camera.png] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 30, 0, 0)\];

UIImageView \*bgView = \[\[UIImageView alloc\] initWithImage:bg\];

bgView.frame = CGRectMake(100, 200, 160, 60);

\[self.view addSubview:bgView\];

\[bg release\];

\[bgView release\];

**参考网页**：[https://developer.apple.com/library/ios/\#documentation/UIKit/Reference/UIImage\_Class/DeprecationAppendix/AppendixADeprecatedAPI.html\#//apple\_ref/occ/instm/UIImage/stretchableImageWithLeftCapWidth:topCapHeight][https_developer.apple.com_library_ios_documentation_UIKit_Reference_UIImage_Class_DeprecationAppendix_AppendixADeprecatedAPI.html_apple_ref_occ_instm_UIImage_stretchableImageWithLeftCapWidth_topCapHeight]:

[https://developer.apple.com/library/ios/\#documentation/UIKit/Reference/UIImage\_Class/Reference/Reference.html\#//apple\_ref/occ/instm/UIImage/resizableImageWithCapInsets][https_developer.apple.com_library_ios_documentation_UIKit_Reference_UIImage_Class_Reference_Reference.html_apple_ref_occ_instm_UIImage_resizableImageWithCapInsets]:

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--yuzhang2

转载于:https://www.cnblogs.com/ydhliphonedev/archive/2012/03/17/2403213.html

[UIImageimageNamed_camera.png]: mailto:%5BUIImageimageNamed:@%22camera.png%22%5D
[https_developer.apple.com_library_ios_documentation_UIKit_Reference_UIImage_Class_DeprecationAppendix_AppendixADeprecatedAPI.html_apple_ref_occ_instm_UIImage_stretchableImageWithLeftCapWidth_topCapHeight]: https://developer.apple.com/library/ios/#documentation/UIKit/Reference/UIImage_Class/DeprecationAppendix/AppendixADeprecatedAPI.html%23//apple_ref/occ/instm/UIImage/stretchableImageWithLeftCapWidth:topCapHeight
[https_developer.apple.com_library_ios_documentation_UIKit_Reference_UIImage_Class_Reference_Reference.html_apple_ref_occ_instm_UIImage_resizableImageWithCapInsets]: https://developer.apple.com/library/ios/#documentation/UIKit/Reference/UIImage_Class/Reference/Reference.html%23//apple_ref/occ/instm/UIImage/resizableImageWithCapInsets