[objc] UIButton 색 바꾸기. change color

    UIButton *delBtn = self.delBtn;

    [delBtn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];

    delBtn.backgroundColor = [UIColor redColor];

    delBtn.layer.backgroundColor = [UIColor redColor].CGColor;

    delBtn.layer.borderColor = [UIColor blackColor].CGColor;

    delBtn.layer.borderWidth = 1.0f;

    delBtn.layer.cornerRadius = 10.0f;

http://stackoverflow.com/questions/2808888/is-it-even-possible-to-change-a-uibuttons-background-color