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2013-09-11T10:12:39.180
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2013-09-11T10:18:27.717
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2013-09-11T10:18:27.717
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instead of a macro I wrote a category for this. It handles RGB(A) value strings with the formats <code>@"#17BAFA(FF)", @"#ABC(F)", @"17BAFA", @"0xABC",…</code> As it uses message sending, rather than a macro call, it feels more natural in the context of Objective-C. Use it like <code>UIColor *color = [UIColor colorFromHexString:@"#DCDFE3"];</code> afterwards you can check <code>if(!color) { // must be an invalid format</code> <pre><code>@implementation UIColor (Creation) +(UIColor *)_colorFromHex:(NSUInteger)hexInt { int r,g,b,a; r = (hexInt >> 030) & 0xFF; g = (hexInt >> 020) & 0xFF; b = (hexInt >> 010) & 0xFF; a = hexInt & 0xFF; return [UIColor colorWithRed:r / 255.0f green:g / 255.0f blue:b / 255.0f alpha:a / 255.0f]; } +(UIColor *)colorFromHexString:(NSString *)hexString { hexString = [hexString stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]]; if ([hexString hasPrefix:@"#"]) hexString = [hexString substringFromIndex:1]; else if([hexString hasPrefix:@"0x"]) hexString = [hexString substringFromIndex:2]; int l = [hexString length]; if ((l!=3) && (l!=4) && (l!=6) && (l!=8)) return nil; if ([hexString length] > 2 && [hexString length]< 5) { NSMutableString *newHexString = [[NSMutableString alloc] initWithCapacity:[hexString length]*2]; [hexString enumerateSubstringsInRange:NSMakeRange(0, [hexString length]) options:NSStringEnumerationByComposedCharacterSequences usingBlock:^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop) { [newHexString appendFormat:@"%@%@", substring, substring]; }]; hexString = newHexString; } if ([hexString length] == 6) hexString = [hexString stringByAppendingString:@"ff"]; NSScanner *scanner = [NSScanner scannerWithString:hexString]; unsigned hexNum; if (![scanner scanHexInt:&hexNum]) return nil; return [self _colorFromHex:hexNum]; } @end </code></pre> <hr> When I pick the keyboards background color with Photoshop, the value is <code>"0xD9DCE0"</code>, not <code>"0xDCDFE3"</code>.
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1. POHow can I reconstruct this Color DCDFE3 using UIColor? To make it display the right color
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1. PTAnswer
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1. USvikingosegundo
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1. USvikingosegundo
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