//Swift button.setTitleColor(color, forControlState: controlState) //Objective-C [button setTitleColor:(nullable UIColor *) forState:(UIControlState)];
将标题颜色设置为蓝色
//Swift button.setTitleColor(.blue, for: .normal) //Objective-C [button setTitleColor:[UIColor blueColor] forState:UIControlStateNormal]