ios 如何在IOS中使用9-patch图像？
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How to use 9-patch images in IOS?
提问by Adams
I want to use 9-patch images in my IOS app. Is it possible?
我想在我的 IOS 应用程序中使用 9-patch 图像。是否可以？
回答by Amy Worrall
Look into UIImage's method resizableImageWithCapInsets:(UIEdgeInsets)capInsets.
查看 UIImage 的方法resizableImageWithCapInsets:(UIEdgeInsets)capInsets。
回答by shiami
You can try this simple implementation: https://github.com/shiami/SWNinePatchImageFactory
你可以试试这个简单的实现：https: //github.com/shiami/SWNinePatchImageFactory
The concept is easy and described as below:
这个概念很简单，描述如下：
The technique is only to transform the 9-patch PNG images to iOS compatible, resizable UIImage objects. See the UIImage's method resizableImageWithCapInsets:(UIEdgeInsets)insets for more info. So it only support to stretch one segment of patch markers in both horizontal and vertical sides.
该技术只是将 9-patch PNG 图像转换为 iOS 兼容、可调整大小的 UIImage 对象。有关详细信息，请参阅 UIImage 的 resizableImageWithCapInsets:(UIEdgeInsets)insets 方法。所以它只支持在水平和垂直两侧拉伸一段补丁标记。
+ (UIImage*)createResizableImageFromNinePatchImage:(UIImage*)ninePatchImage
{
NSArray* rgbaImage = [self getRGBAsFromImage:ninePatchImage atX:0 andY:0 count:ninePatchImage.size.width * ninePatchImage.size.height];
NSArray* topBarRgba = [rgbaImage subarrayWithRange:NSMakeRange(1, ninePatchImage.size.width - 2)];
NSMutableArray* leftBarRgba = [NSMutableArray arrayWithCapacity:0];
int count = [rgbaImage count];
for (int i = 0; i < count; i += ninePatchImage.size.width) {
[leftBarRgba addObject:rgbaImage[i]];
}
int top = -1, left = -1, bottom = -1, right = -1;
count = [topBarRgba count];
for (int i = 0; i <= count - 1; i++) {
NSArray* aColor = topBarRgba[i];
if ([aColor[3] floatValue] == 1) {
left = i;
break;
}
}
NSAssert(left != -1, @"The 9-patch PNG format is not correct.");
for (int i = count - 1; i >= 0; i--) {
NSArray* aColor = topBarRgba[i];
if ([aColor[3] floatValue] == 1) {
right = i;
break;
}
}
NSAssert(right != -1, @"The 9-patch PNG format is not correct.");
for (int i = left + 1; i <= right - 1; i++) {
NSArray* aColor = topBarRgba[i];
if ([aColor[3] floatValue] < 1) {
NSAssert(NO, @"The 9-patch PNG format is not support.");
}
}
count = [leftBarRgba count];
for (int i = 0; i <= count - 1; i++) {
NSArray* aColor = leftBarRgba[i];
if ([aColor[3] floatValue] == 1) {
top = i;
break;
}
}
NSAssert(top != -1, @"The 9-patch PNG format is not correct.");
for (int i = count - 1; i >= 0; i--) {
NSArray* aColor = leftBarRgba[i];
if ([aColor[3] floatValue] == 1) {
bottom = i;
break;
}
}
NSAssert(bottom != -1, @"The 9-patch PNG format is not correct.");
for (int i = top + 1; i <= bottom - 1; i++) {
NSArray* aColor = leftBarRgba[i];
if ([aColor[3] floatValue] == 0) {
NSAssert(NO, @"The 9-patch PNG format is not support.");
}
}
UIImage* cropImage = [ninePatchImage crop:CGRectMake(1, 1, ninePatchImage.size.width - 2, ninePatchImage.size.height - 2)];
return [cropImage resizableImageWithCapInsets:UIEdgeInsetsMake(top, left, bottom, right)];
}
SWNinePatchImageView also provides the Nib or Storyboard usage. You can check the example project in the repo.
SWNinePatchImageView 还提供 Nib 或 Storyboard 用法。您可以在 repo 中查看示例项目。
回答by avi9111
the most probable result is https://github.com/andylanddev/Tortuga22-NinePatch9-patch library have already used bellow method resizableImageWithCapInsets:(UIEdgeInsets)insets
最可能的结果是 https://github.com/andylanddev/Tortuga22-NinePatch9-patch 库已经使用了波纹管方法 resizableImageWithCapInsets:(UIEdgeInsets)insets
