iOS 之如何将#000000颜色转化成RGB

最新推荐文章于 2024-01-12 14:38:36 发布

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该代码段展示了如何在iOS中将十六进制颜色代码（如#000000）转换为UIColor的RGB值。通过清理输入字符串，处理不同长度的十六进制代码，并使用位移和位操作来提取红、绿、蓝和透明度值，最终创建并返回对应的UIColor对象。

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+ (UIColor *) colorFromHexCode:(NSString *)hexString {
NSString *cleanString = [hexString stringByReplacingOccurrencesOfString:@"#" withString:@""];
if([cleanString length] == 3) {
cleanString = [NSString stringWithFormat:@"%@%@%@%@%@%@",
[cleanString substringWithRange:NSMakeRange(0, 1)],[cleanString substringWithRange:NSMakeRange(0, 1)],
[cleanString substringWithRange:NSMakeRange(1, 1)],[cleanString substringWithRange:NSMakeRange(1, 1)],
[cleanString substringWithRange:NSMakeRange(2, 1)],[cleanString substringWithRange:NSMakeRange(2, 1)]];
}
if([cleanString length] == 6) {
cleanString = [cleanString stringByAppendingString:@"ff"];
}

unsigned int baseValue;
[[NSScanner scannerWithString:cleanString] scanHexInt:&baseValue];

float red = ((baseValue >> 24) & 0xFF)/255.0f;
float green = ((baseValue >> 16) & 0xFF)/255.0f;
float blue = ((baseValue >> 8) & 0xFF)/255.0f;
float alpha = ((baseValue >> 0) & 0xFF)/255.0f;

return [UIColor colorWithRed:red green:green blue:blue alpha:alpha];
}