得到UIColor的总结

一种就是根据RGB可以返回需要的UIColor。这种是IOS自带的，在类库UIKit.framework中存在。

 

    UIColor *color = [UIColor colorWithRed:25 green:25 blue:25 alpha:1];

另一种就是，根据颜色代码，通过转换成RGB，得到UIColor。这种在实际的开发中运用得比较多，非常实用。

 

 

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

{

	NSString *cString = [[stringToConvert stringByTrimmingCharactersInSet:

						  [NSCharacterSet whitespaceAndNewlineCharacterSet]]

						 uppercaseString];

	

	// String should be 6 or 8 characters

	if ([cString length] < 6) return DEFAULT_VOID_COLOR;

	

	// strip 0X if it appears

	if ([cString hasPrefix:@"0X"]) cString = [cString substringFromIndex:2];

	

    NSRange myrange = [cString rangeOfString:@"#"];

    if (myrange.location != NSNotFound)

    {

        cString = [cString substringFromIndex:1];

    }

	if ([cString length] != 6) return DEFAULT_VOID_COLOR;

	// Separate into r, g, b substrings

	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];

	// 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];

}