UIColor (16进制颜色、透明色使用)

最新推荐文章于 2024-02-19 10:22:47 发布

原创最新推荐文章于 2024-02-19 10:22:47 发布 · 2.7k 阅读

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#UI颜色值

本文介绍了一种将十六进制颜色值转换为RGB颜色值的方法，并提供了一个Objective-C函数实现。通过解析十六进制字符串并将其转换为对应的红、绿、蓝三文鱼数值，进而创建出UIColor对象。

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RGB与十六进制互转

http://tool.css-js.com/rgba.html

十六进颜色 (#03a9f4 0x050301)

+(UIColor *)becomeHexColor:(NSString *)hexColor

   NSString *cString = [[hexColorstringByTrimmingCharactersInSet:[NSCharacterSetwhitespaceAndNewlineCharacterSet]]uppercaseString];
    if ([cString length] < 6) return [UIColor blackColor];
    
    if ([cString hasPrefix:@"0X"])  cString = [cString substringFromIndex:2];
    if ([cString hasPrefix:@"#"])   cString = [cString substringFromIndex:1];
    if ([cString length] != 6) return [UIColor blackColor];
    
    NSRange range;
    range.location = 0;
    range.length = 2;
    NSString *rColorValue = [cString substringWithRange:range];
    range.location = 2;
    NSString *gColorValue = [cString substringWithRange:range];
    range.location = 4;
    NSString *bColorValue = [cString substringWithRange:range];
    
    unsigned int r, g, b;
    [[NSScanner scannerWithString:rColorValue] scanHexInt:&r];
    [[NSScanner scannerWithString:gColorValue] scanHexInt:&g];
    [[NSScanner scannerWithString:bColorValue] scanHexInt:&b];
    
    UIColor *color = [UIColor colorWithRed:((CGFloat) r / 255.0f) green:((CGFloat) g / 255.0f) blue:((CGFloat) b / 255.0f) alpha:1.0f];
    return color;
}

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