iOS-悬浮按钮

在项目中可能会有这种需求,即在一个界面最顶层需要一个按钮,这个按钮可能是发布信息功能,也可能是回到顶部.这样我们可以使用uiwindow这个神奇的控件实现,很简单.

完整项目:
https://github.com/qxuewei/xwsuspendbtn

最终实现效果如下:

实现逻辑:
1.在需要出现悬浮按钮的类中声明按钮uibutton属性和uiwindow属性喎? f/ware/vc/"="" target="_blank" class="keylink">vcd4ncjxwcmugy2xhc3m9"brush:java;"> /** window */ @property (nonatomic, strong) uiwindow *window; /** 悬浮按钮 */ @property (nonatomic, strong) uibutton *button;

2.创建uiwindow以及悬浮按钮方法

-(void)creatsuspendbtn{
    //悬浮按钮
    _button = [uibutton buttonwithtype:uibuttontypecustom];
    [_button setimage:[uiimage imagenamed:@"plus"] forstate:uicontrolstatenormal];
    cgfloat screenwidth = [uiscreen mainscreen].bounds.size.width;
    cgfloat screenheight = [uiscreen mainscreen].bounds.size.height;
    _button.frame = cgrectmake(0,0, 64, 64);
    [_button addtarget:self action:@selector(suspendbtnclick) forcontrolevents:uicontroleventtouchupinside];

    //悬浮按钮所处的顶端uiwindow
    _window = [[uiwindow alloc] initwithframe:cgrectmake(screenwidth*0.5-32, screenheight-84, 64, 64)];
    //使得新建window在最顶端
    _window.windowlevel = uiwindowlevelalert + 1;
    _window.backgroundcolor = [uicolor clearcolor];
    [_window addsubview:_button];
    //显示window
    [_window makekeyandvisible];
}

3.初始化视图时创建悬浮按钮

- (void)viewdidload {
    [super viewdidload];
    // do any additional setup after loading the view, typically from a nib.
    [self.maintableview setdelegate:self];
    [self.maintableview setdatasource:self];

    //延时加载window,注意我们需要在rootwindow创建完成之后再创建这个悬浮的按钮
    [self performselector:@selector(creatsuspendbtn) withobject:nil afterdelay:0.2];

}

项目github地址:
https://github.com/qxuewei/xwsuspendbtn

喎?>