颜色转换 IOS中十六进制的颜色转换为UIColor

可用类别写一个  方便使用

+ (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];

}