关于iOS中的颜色

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宏定义颜色设置方法

#define UIColorFromRGB(rgbValue) [UIColor colorWithRed:((float)((rgbValue & 0xFF0000) >> 16))/255.0 green:((float)((rgbValue & 0xFF00) >> 8))/255.0 blue:((float)(rgbValue & 0xFF))/255.0 alpha:1.0]// 获取RGB颜色#define RGBA(r,g,b,a) [UIColor colorWithRed:r/255.0f green:g/255.0f blue:b/255.0f alpha:a]#define RGB(r,g,b) RGBA(r,g,b,1.0f)//我自己感觉的一些比较好看的颜色：#define SoftColorWhite [UIColor whiteColor]#define SoftColorYellow RGB(255, 198, 57) //淡黄色#define SoftColorBlue RGB(73, 133, 234)#define SoftColorGreen RGB(143, 208, 79)#define SoftColorPurple RGB(254, 243, 155)#define SoftColorRed RGB(250, 86, 60)#define SoftColorGray RGB(193, 197, 209)#define PaperColor PaperColorWhite#define PaperBackgroundColor RGB(193, 197, 209)

获取图片某像素点颜色的方法（为UIImage添加扩展方法）：

- (UIColor *)colorAtPixel:(CGPoint)point {    // Cancel if point is outside image coordinates    if (!CGRectContainsPoint(CGRectMake(0.0f, 0.0f, self.size.width, self.size.height), point)) {        return nil;    }    NSInteger pointX = trunc(point.x);    NSInteger pointY = trunc(point.y);    CGImageRef cgImage = self.CGImage;    NSUInteger width = self.size.width;    NSUInteger height = self.size.height;    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();    int bytesPerPixel = 4;    int bytesPerRow = bytesPerPixel * 1;    NSUInteger bitsPerComponent = 8;    unsigned char pixelData[4] = { 0, 0, 0, 0 };    CGContextRef context = CGBitmapContextCreate(pixelData,1, 1，bitsPerComponent,bytesPerRow, colorSpace,kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big);    CGColorSpaceRelease(colorSpace);    CGContextSetBlendMode(context, kCGBlendModeCopy);    // Draw the pixel we are interested in onto the bitmap context    CGContextTranslateCTM(context, -pointX, pointY-(CGFloat)height);    CGContextDrawImage(context, CGRectMake(0.0f, 0.0f, (CGFloat)width, (CGFloat)height), cgImage);    CGContextRelease(context);    // Convert color values [0..255] to floats [0.0..1.0]    CGFloat red   = (CGFloat)pixelData[0] / 255.0f;    CGFloat green = (CGFloat)pixelData[1] / 255.0f;    CGFloat blue  = (CGFloat)pixelData[2] / 255.0f;    CGFloat alpha = (CGFloat)pixelData[3] / 255.0f;    return [UIColor colorWithRed:red green:green blue:blue alpha:alpha];}

由于是个人开发者，所以UI设计比较头疼
一些看着比较舒服的颜色的RGB值

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