Question

我使用UILabel显示文本，有时显示正确的颜色，有时则不显示。我使用的是一个简单的UILabel对象，下面是我的代码：

UILabel *costomerTel = [[UILabel alloc] init];
costomerTel.textColor = RSColor(@"#0b192e");
costomerTel.font = RSFont(12);
costomerTel.text = @"+86 18888888888"
[self addSubview:costomerTel];

UILabel *costomerDesc = [[UILabel alloc] init];
costomerDesc.textColor = RSColor(@"#0b192e");
costomerDesc.font = RSFont(12);
costomerDesc.text = @"北京·项目经理"
[self addSubview: costomerDesc];

下面是图片，它在iPhone中显示： the top label's color is not correct

RSColor代码：

+ (UIColor *) colorWithHexString : (NSString *) color
{
   NSString *cString = [[color stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];

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

// 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 clearColor];

// Separate into r, g, b substrings
NSRange range;
range.location = 0;
range.length = 2;

//r
NSString *rString = [cString substringWithRange:range];

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

//b
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];

}

任何帮助都表示赞赏。谢谢

Answer 1

只需将此代码替换为以下代码

即可

// Separate into r, g, b substrings
NSRange range;
range.location = 0;
range.length = 2;

替换为此代码

// If Hex String Has Alpha Component
    NSInteger startRange = 0;
    CGFloat colorAlpha = 1.0f;
    // Separate into a, r, g, b substrings
    NSRange range;
    range.length = 2;
    if ([cString length] == 8) {
        range.location = startRange;
        NSString *aString = [cString substringWithRange:range];
        colorAlpha = [self alphaFromHexCode:aString];
        startRange = 2;
    }

如果您仍然面临问题，请告诉我。

+ (CGFloat)alphaFromHexCode:(NSString *)hexCode {
    unsigned int per;
    [[NSScanner scannerWithString:hexCode] scanHexInt:&per];
    return ((float) per / 255.0f);
}

在这里，它也将转换你的8位十六进制颜色，这可能是我们在Android和有时网络使用。

所以它就像@“00FFFFFF”意味着前两个char包含颜色的alpha，所以你必须找出该颜色的alpha。

iOS UILabel有时无法显示正确的颜色

1 个答案: