98.png
有需求是保留image1上的褶皺（視覺上）绒窑，而替換不同的花色
UIGraphicsBeginImageContextWithOptions(newSize, NO, 1.f);
[image1 drawInRect:CGRectMake(0,0,newSize.width,newSize.height) blendMode:kCGBlendModeOverlay alpha:1.f];
[image2 drawInRect:CGRectMake(0,0,newSize.width,newSize.height) blendMode:kCGBlendModeSoftLight alpha:0.7f];
UIImage *finalImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
這里列一下圖片的混合模式
typedef CF_ENUM (int32_t, CGBlendMode) {
kCGBlendModeNormal,
kCGBlendModeMultiply,
kCGBlendModeScreen,
kCGBlendModeOverlay,
kCGBlendModeDarken,
kCGBlendModeLighten,
kCGBlendModeColorDodge,
kCGBlendModeColorBurn,
kCGBlendModeSoftLight,
kCGBlendModeHardLight,
kCGBlendModeDifference,
kCGBlendModeExclusion,
kCGBlendModeHue,
kCGBlendModeSaturation,
kCGBlendModeColor,
kCGBlendModeLuminosity,
kCGBlendModeClear, /* R = 0 */
kCGBlendModeCopy, /* R = S */
kCGBlendModeSourceIn, /* R = S*Da */
kCGBlendModeSourceOut, /* R = S*(1 - Da) */
kCGBlendModeSourceAtop, /* R = S*Da + D*(1 - Sa) */
kCGBlendModeDestinationOver, /* R = S*(1 - Da) + D */
kCGBlendModeDestinationIn, /* R = D*Sa */
kCGBlendModeDestinationOut, /* R = D*(1 - Sa) */
kCGBlendModeDestinationAtop, /* R = S*(1 - Da) + D*Sa */
kCGBlendModeXOR, /* R = S*(1 - Da) + D*(1 - Sa) */
kCGBlendModePlusDarker, /* R = MAX(0, (1 - D) + (1 - S)) */
kCGBlendModePlusLighter /* R = MIN(1, S + D) */
};
具體什么樣的效果需要動手試試了。
