[UIKit] UIColor

// 색상 배합
UIColor *color = [UIColor colorWithRed:0.0 green:0.5 blue:1.0 alpha:1.0];

// 지정색
UIColor *color = [UIColor whiteColor];

// 패턴 지정
UIImage *hogeImage = [UIImage imageNamed:@"hoge.png"];
UIColor *color = [[UIColor alloc] initWithPatternImage:hogeImage];

// 알파
UIColor *color = [UIColor blueColor];
UIColor *acolor = [color colorWithAlphaComponent:0.5]; //透過率50%