UIButton的介紹和方法的使用

介紹一個OC中的控件UIButton，顧名思義就是按鈕

1. 初始化 

UIButton*btn=[UIButton buttonWithType:(UIButtonType)];

 UIButtonType是系統提供的，用來指定Button類型的枚舉

    UIButtonTypeCustom

     UIButtonTypeSystem

     UIButtonTypeDetailDisclosure

     UIButtonTypeInfoLight

     UIButtonTypeInfoDark

     UIButtonTypeContactAdd

   2. 設置座標

btn.frame=CGRectMake(0, 0, 10, 10);

3.設置編號

btn.tag=0;

  4 .設置標題

[btn setTitle:(nullable NSString *) forState:(UIControlState)];

 在這裏又出現一個枚舉類型<#(UIControlState)#>

     默認

     UIControlStateNormal

     高亮

     UIControlStateHighlighted  

     不可點擊狀態

     UIControlStateDisabled

     已被選中狀態

     UIControlStateSelected

[btn setTitle:@"肯定" forState:UIControlStateNormal];
  [btn setTitle:@"取消" forState:UIControlStateHighlighted];

 5.修改字體顏色

[btn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];

6 .增添點擊事件

[btn addTarget:self action:@selector(selector) forControlEvents:(UIControlEvents)];

 這裏出現一個枚舉類型(UIControlEvents)，分別表明不一樣的點擊手勢

    UIControlEventTouchDown

    UIControlEventTouchDownRepeat

    UIControlEventTouchDragInside

    UIControlEventTouchDragOutside

    UIControlEventTouchDragEnter

    UIControlEventTouchDragExit

    UIControlEventTouchUpInside

    UIControlEventTouchUpOutside

7.設置字體大小

btn.titleLabel.font=[UIFont systemFontOfSize:12];