颜色与十六进制值的互转

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转自：达内科技

颜色与十六进制值的互转

作者:广州达内科技更新时间:2013-03-04 13:35 来源:Android开发培训

1.//字符串转颜色
2.- (UIColor *) colorWithHexString: (NSString *) stringToConvert {
3.    NSString *cString = [[stringToConvert stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];
4.
5.    if ([cString length] < 6)
6.        return [UIColor whiteColor];
7.    if ([cString hasPrefix:@"#"])
8.        cString = [cString substringFromIndex:1];
9.    if ([cString length] != 6)
10.        return [UIColor whiteColor];
11.
12.    NSRange range;
13.    range.location = 0;
14.    range.length = 2;
15.    NSString *rString = [cString substringWithRange:range];
16.
17.    range.location = 2;
18.    NSString *gString = [cString substringWithRange:range];
19.
20.    range.location = 4;
21.    NSString *bString = [cString substringWithRange:range];
22.
23.    unsigned int r, g, b;
24.    [[NSScanner scannerWithString:rString] scanHexInt:&r];
25.    [[NSScanner scannerWithString:gString] scanHexInt:&g];
26.    [[NSScanner scannerWithString:bString] scanHexInt:&b];
27.
28.    return [UIColor colorWithRed:((float) r / 255.0f)
29.                           green:((float) g / 255.0f)
30.                            blue:((float) b / 255.0f)
31.                           alpha:1.0f];
32.}
33.
34.//颜色转字符串
35.- (NSMutableArray *) changeUIColorToRGB:(UIColor *)color {
36.    const CGFloat *cs = CGColorGetComponents(color.CGColor);
37.
38.    NSString *r = [NSString stringWithFormat:@"%@", [self ToHex:cs[0] * 255]];
39.    NSString *g = [NSString stringWithFormat:@"%@", [self ToHex:cs[1] * 255]];
40.    NSString *b = [NSString stringWithFormat:@"%@", [self ToHex:cs[2] * 255]];
41.    return [NSString stringWithFormat:@"#%@%@%@", r, g, b];
42.}
43.
44.//十进制转十六进制
45.- (NSString *)ToHex:(int)tmpid {
46.    NSString *endtmp = @"";
47.    NSString *nLetterValue;
48.    NSString *nStrat;
49.    int ttmpig = tmpid % 16;
50.    int tmp = tmpid / 16;
51.    switch (ttmpig) {
52.        case 10:
53.            nLetterValue = @"A"; break;
54.        case 11:
55.            nLetterValue = @"B"; break;
56.        case 12:
57.            nLetterValue = @"C"; break;
58.        case 13:
59.            nLetterValue = @"D"; break;
60.        case 14:
61.            nLetterValue = @"E"; break;
62.        case 15:
63.            nLetterValue = @"F"; break;
64.        default:nLetterValue = [[NSString alloc] initWithFormat:@"%i", ttmpig];
65.    }
66.    switch (tmp) {
67.        case 10:
68.            nStrat = @"A"; break;
69.        case 11:
70.            nStrat = @"B"; break;
71.        case 12:
72.            nStrat = @"C"; break;
73.        case 13:
74.            nStrat = @"D"; break;
75.        case 14:
76.            nStrat = @"E"; break;
77.        case 15:
78.            nStrat = @"F"; break;
79.        default:nStrat = [[NSString alloc] initWithFormat:@"%i", tmp];
80.    }
81.    endtmp = [[NSString alloc] initWithFormat:@"%@%@", nStrat, nLetterValue];
82.    return endtmp;
83.}