UITabBarItem+LhGray.m
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//
// UITabBarItem+LhGray.m
// SmartCity
//
// Created by luoh on 2021/3/25.
// Copyright © 2021 StarHome. All rights reserved.
//
#import "UITabBarItem+LhGray.h"
#import <objc/runtime.h>
@implementation UITabBarItem (LhGray)
+ (void)lh_tabbarItemSwizzldMethedWith:(BOOL)changeGray{
if (changeGray == false) {
return;
}
Class cls = [self class];
SEL oriSel = @selector(setSelectedImage:);
SEL swizzldSel = @selector(lh_setTabbarItemImage:);
Method originMethed = class_getInstanceMethod(cls, oriSel);
Method swizzldMethed = class_getInstanceMethod(cls, swizzldSel);
BOOL isAddMethed = class_addMethod(cls, oriSel, method_getImplementation(swizzldMethed),method_getTypeEncoding(swizzldMethed));
if (isAddMethed) {
class_replaceMethod(cls, swizzldSel, method_getImplementation(originMethed), method_getTypeEncoding(originMethed));
}else{
method_exchangeImplementations(originMethed,swizzldMethed);
}
}
- (void)lh_setTabbarItemImage:(UIImage *)image {
UIImage *im = [[self imageToTransparent:image] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
[self lh_setTabbarItemImage:im];
}
- (UIImage*)imageToTransparent:(UIImage*) image
{
// 分配内存
const int imageWidth = image.size.width;
const int imageHeight = image.size.height;
size_t bytesPerRow = imageWidth * 4;
uint32_t* rgbImageBuf = (uint32_t*)malloc(bytesPerRow * imageHeight);
// 创建context
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef context = CGBitmapContextCreate(rgbImageBuf, imageWidth, imageHeight, 8, bytesPerRow, colorSpace,
kCGBitmapByteOrder32Little | kCGImageAlphaNoneSkipLast);
CGContextDrawImage(context, CGRectMake(0, 0, imageWidth, imageHeight), image.CGImage);
// 遍历像素
int pixelNum = imageWidth * imageHeight;
uint32_t* pCurPtr = rgbImageBuf;
for (int i = 0; i < pixelNum; i++, pCurPtr++)
{
uint8_t* ptr = (uint8_t*)pCurPtr;
if (ptr[3] < 50 && ptr[3] < 50 && ptr[1] < 50) {
ptr[0] = 0;
} else {
// 灰度算法
uint8_t gray = ptr[3] * 0.299 + ptr[2] * 0.587 + ptr[1] * 0.114;
ptr[3] = gray; //0~255
ptr[2] = gray;
ptr[1] = gray;
}
}
// 将内存转成image
CGDataProviderRef dataProvider =CGDataProviderCreateWithData(NULL, rgbImageBuf, bytesPerRow * imageHeight, ProviderReleaseData);
CGImageRef imageRef = CGImageCreate(imageWidth, imageHeight,8, 32, bytesPerRow, colorSpace,
kCGImageAlphaLast |kCGBitmapByteOrder32Little, dataProvider,
NULL, true,kCGRenderingIntentDefault);
CGDataProviderRelease(dataProvider);
UIImage* resultUIImage = [UIImage imageWithCGImage:imageRef];
// 释放
CGImageRelease(imageRef);
CGContextRelease(context);
CGColorSpaceRelease(colorSpace);
return resultUIImage;
}
void ProviderReleaseData (void *info, const void *data, size_t size)
{
free((void*)data);
}
@end