16进制与UIColor互换

来源：http://www.cnblogs.com/yang-guang-girl/p/4137876.html

--恋雪的博客园

 输入16进制颜色编码，显示对应的UIColor，我在项目中也用到了，还是不错的

代码如下

 1 - (void)viewDidLoad
 2 {
 3     [super viewDidLoad];
 4     // Do any additional setup after loading the view.
 5     
 6     UIView *view=[[UIView alloc]initWithFrame:CGRectMake(50, 100, 200, 200)];
 7     view.backgroundColor=[self colorWithHexString:@"e26562"];
 8     [self.view addSubview:view];
 9     
10 }
11 //16进制颜色#e26562与UIColor互转,设置View背景颜色
12 - (UIColor *) colorWithHexString: (NSString *)color
13 {
14     NSString *cString = [[color stringByTrimmingCharactersInSet:
　　　　　　　　　　　　　　　　　　　　[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];
15     
16     // String should be 6 or 8 characters
17     if ([cString length] < 6) {
18         return [UIColor clearColor];
19     }
20     
21     // strip 0X if it appears
22     if ([cString hasPrefix:@"0X"])
23         cString = [cString substringFromIndex:2];
24     if ([cString hasPrefix:@"#"])
25         cString = [cString substringFromIndex:1];
26     if ([cString length] != 6)
27         return [UIColor clearColor];
28     
29     // Separate into r, g, b substrings
30     NSRange range;
31     range.location = 0;
32     range.length = 2;
33     
34     //r
35     NSString *rString = [cString substringWithRange:range];
36     
37     //g
38     range.location = 2;
39     NSString *gString = [cString substringWithRange:range];
40     
41     //b
42     range.location = 4;
43     NSString *bString = [cString substringWithRange:range];
44     
45     // Scan values
46     unsigned int r, g, b;
47     [[NSScanner scannerWithString:rString] scanHexInt:&r];
48     [[NSScanner scannerWithString:gString] scanHexInt:&g];
49     [[NSScanner scannerWithString:bString] scanHexInt:&b];
50     
51     return [UIColor colorWithRed:((float) r / 255.0f) 
　　　　　　　　　　　　　　　　　 green:((float) g / 255.0f) 
　　　　　　　　　　　　　　　　　　blue:((float) b / 255.0f) 
　　　　　　　　　　　　　　　　　 alpha:1.0f];
52 }

 

posted @ 2014-12-09 01:44  沫影  阅读(129)  评论(0)    收藏  举报