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:
![这里写图片描述](http://www.lhsxpumps.com/_images3/10qianwan/20190105/b_0_201901050131258625.jpg "\")
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
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-(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
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