[iOS]把16进制颜色转换UIColor

- (void)viewDidLoad {

[super
viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

UIColor *color = [self
colorWithHexString:@"#81c52b"];

[self.view
setBackgroundColor:color];

}

- (UIColor *) colorWithHexString: (NSString *) stringToConvert

{

NSString *cString = [[stringToConvert
stringByTrimmingCharactersInSet:[NSCharacterSet
whitespaceAndNewlineCharacterSet]]
uppercaseString];//字符串处理

//例子，stringToConvert #ffffff

if ([cString
length] < 6)

return [UIColor
redColor];//如果非十六进制，返回白色

if ([cString
hasPrefix:@"#"])

cString = [cString substringFromIndex:1];//去掉头

if ([cString
length] != 6)//去头非十六进制，返回白色

return [UIColor
greenColor];

//分别取RGB的值

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];

unsigned
int r, g, b;

//NSScanner把扫描出的制定的字符串转换成Int类型

[[NSScanner scannerWithString:rString] scanHexInt:&r];

[[NSScanner scannerWithString:gString] scanHexInt:&g];

[[NSScanner scannerWithString:bString] scanHexInt:&b];

//转换为UIColor

return [UIColor colorWithRed:((float) r /
255.0f)

green:((float) g /
255.0f)

blue:((float) b /
255.0f)

alpha:1.0f];

}

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