Question

我想在我的IOS应用中使用9补丁图片。有可能吗？

Answer 1

查看UIImage的方法resizableImageWithCapInsets:(UIEdgeInsets)capInsets。

Answer 2

您可以尝试这个简单的实现： https://github.com/shiami/SWNinePatchImageFactory

这个概念很简单，如下所述：

该技术仅用于将9补丁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的方法resizableImageWithCapInsets：（UIEdgeInsets）insets。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还提供Nib或Storyboard用法。您可以在仓库中检查示例项目。

Answer 3

最可能的结果是 https://github.com/andylanddev/Tortuga22-NinePatch 9-patch库已经使用了波纹管方法 resizableImageWithCapInsets：（UIEdgeInsets）插图

如何在IOS中使用9补丁图像？

3 个答案: