-(UIColor*)mostColor
{
#if __IPHONE_OS_VERSION_MAX_ALLOWED > __IPHONE_6_1
intbitmapInfo = kCGBitmapByteOrderDefault | kCGImageAlphaPremultipliedLast;
#else
intbitmapInfo = kCGImageAlphaPremultipliedLast;
#endif
//第一步 先把图片缩小 加快计算速度. 但越小结果误差可能越大
CGSize thumbSize=CGSizeMake(50, 50);
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef context = CGBitmapContextCreate(NULL,
thumbSize.width,
thumbSize.height,
8,//bits per component
thumbSize.width*4,
colorSpace,
bitmapInfo);
CGRect drawRect = CGRectMake(0, 0, thumbSize.width, thumbSize.height);
CGContextDrawImage(context, drawRect,self.CGImage);
CGColorSpaceRelease(colorSpace);
//第二步 取每个点的像素值
unsignedchar* data = CGBitmapContextGetData (context);
if(data ==NULL)returnnil;
NSCountedSet*cls=[NSCountedSetsetWithCapacity:thumbSize.width*thumbSize.height];
for(intx=0; x
for(inty=0; y
intoffset = 4*(x*y);
intred = data[offset];
intgreen = data[offset+1];
intblue = data[offset+2];
intalpha = data[offset+3];
NSArray*clr=@[@(red),@(green),@(blue),@(alpha)];
[cls addObject:clr];
}
}
CGContextRelease(context);
//第三步 找到出现次数最多的那个颜色
NSEnumerator*enumerator = [cls objectEnumerator];
NSArray*curColor =nil;
NSArray*MaxColor=nil;
NSUIntegerMaxCount=0;
while ( (curColor = [enumerator nextObject]) !=nil)
{
NSUIntegertmpCount = [cls countForObject:curColor];
if( tmpCount < MaxCount )continue;
MaxCount=tmpCount;
MaxColor=curColor;
}
return[UIColor colorWithRed:([MaxColor[0] intValue]/255.0f) green:([MaxColor[1] intValue]/255.0f) blue:([MaxColor[2] intValue]/255.0f) alpha:([MaxColor[3] intValue]/255.0f)];
}
