IOS中十六進位的色彩轉換為UIColor

 　　可用類別寫一個 方便使用

　　+ (UIColor *) colorWithHexString: (NSString *)color

　　{

　　NSString *cString = [[colorstringByTrimmingCharactersInSet:[NSCharacterSetwhitespaceAndNewlineCharacterSet]] uppercaseString];

　　// String should be 6 or 8 characters

　　if ([cString length] <6) {

　　return [UIColorclearColor];

　　}

　　// strip 0X if it appears

　　if ([cString hasPrefix:@"0X"])

　　cString = [cStringsubstringFromIndex:2];

　　if ([cString hasPrefix:@"#"])

　　cString = [cStringsubstringFromIndex:1];

　　if ([cString length] !=6)

　　return [UIColorclearColor];

　　// 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;

　　[[NSScannerscannerWithString:rString] scanHexInt:&r];

　　[[NSScannerscannerWithString:gString] scanHexInt:&g];

　　[[NSScannerscannerWithString:bString] scanHexInt:&b];

　　return [UIColorcolorWithRed:((float) r /255.0f) green:((float) g /255.0f) blue:((float) b /255.0f) alpha:1.0f];

　　}