如何在ios中为按钮边框设置十六进制颜色代码答案

【问题标题】：how to set hex color code for button border in ios如何在ios中为按钮边框设置十六进制颜色代码
【发布时间】：2015-09-18 08:04:38
【问题描述】：

我想为按钮边框设置十六进制颜色代码。我该怎么做。帮我解决这个问题。thanx。我已经设置了这样的颜色。

self.buttonone.layer.borderColor = [UIColor greenColor].CGColor;

【问题讨论】：

how to set hex color code for background 的可能重复项
@anuk 您必须接受一种已使用并为您提供帮助的解决方案，因此如果其他用户遇到与他/她相同的问题，他/她很容易找到解决方案。

标签： ios

【解决方案1】：

HEX 到 RGB

// takes @"#123456"
- (UIColor *)colorWithHexString:(NSString *)str 
{
    const char *cStr = [str cStringUsingEncoding:NSASCIIStringEncoding];
    long x = strtol(cStr+1, NULL, 16);
    return [UIColor colorWithHex:x];
}

// takes 0x123456
- (UIColor *)colorWithHex:(UInt32)col 
{
    unsigned char r, g, b;
    b = col & 0xFF;
    g = (col >> 8) & 0xFF;
    r = (col >> 16) & 0xFF;
    return [UIColor colorWithRed:(float)r/255.0f green:(float)g/255.0f blue:(float)b/255.0f alpha:1];
}

RGB 到 HEX

- (NSString *)hexStringForColor:(UIColor *)color 
{
  const CGFloat *components = CGColorGetComponents(color.CGColor);
  CGFloat r = components[0];
  CGFloat g = components[1];
  CGFloat b = components[2];
  NSString *hexString=[NSString stringWithFormat:@"%02X%02X%02X", (int)(r * 255), (int)(g * 255), (int)(b * 255)];
  return hexString;
}

【讨论】：

【解决方案2】：

输入下面的代码，你的工作就会成功。

 self.buttonone.layer.borderColor = [[self colorFromGexString:@"AABBFF"]CGColor];

只需把下面的方法和调用

- (UIColor *)colorFromHexString:(NSString *)hexString
{
    NSString *cString = [[hexString stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];

    // String should be 6 or 8 characters
    if ([cString length] < 6) return [UIColor grayColor];

    // strip 0X if it appears
    if ([cString hasPrefix:@"0X"]) cString = [cString substringFromIndex:2];

    if ([cString hasPrefix:@"#"]) cString = [cString substringFromIndex:1];

    if ([cString length] != 6) return [UIColor grayColor];

    // Separate into r, g, b substrings
    NSRange range;
    range.location = 0;
    range.length = 2;
    NSString *rString = [cString substringWithRange:range];

    range.location = 2;
    NSString *gString = [cString substringWithRange:range];

    range.location = 4;
    NSString *bString = [cString substringWithRange:range];

    // Scan values
    unsigned int r, g, b;
    [[NSScanner scannerWithString:rString] scanHexInt:&r];
    [[NSScanner scannerWithString:gString] scanHexInt:&g];
    [[NSScanner scannerWithString:bString] scanHexInt:&b];

    return [UIColor colorWithRed:((float) r / 255.0f)
                       green:((float) g / 255.0f)
                        blue:((float) b / 255.0f)
                       alpha:1.0f];
}

【讨论】：