作用：
该悬浮窗显示后切换viewController也会显示，需要手动或设置定时器使之消失。
用法：
在需要用到该悬浮提示窗的时候，使用工厂方法，并传入参数2个参数：AlertWindowPositionOption和要显示的文字text。
其中AlertWindowPositionOption为自定义的位置选项，分别为：
AlertWindowPositionTopMiddle 靠窗口上部并纵向居中
AlertWindowPositionCenter 窗口中心位置
AlertWindowPositionBottomMiddle 靠窗口�下部并纵向居中
步骤：
step1：新建一个类CustomAlertWindow，基于UIWindow
step2：自定义该Window
分别在2个文件中写入如下代码：
//CustomAlertWindow.h
#import <UIKit/UIKit.h>
typedef NS_ENUM(NSInteger, AlertWindowPositionOption) {
AlertWindowPositionTopMiddle = 0,
AlertWindowPositionCenter,
AlertWindowPositionBottomMiddle
};
@interface CustomAlertWindow : UIWindow
+ (instancetype)aletWindowWithPositionOption:(AlertWindowPositionOption)positionType andInfoText:(NSString *)text;
//显示
- (void)show;
// 消失
- (void)dismiss;
@end
//CustomAlertWindow.m
#import "CustomAlertWindow.h"
#define LABEL_MARGIN 10 //Label的外边距
#define CENTER_Y_TO_EDGE 80 //悬浮窗中心点距边缘的纵坐标值
@implementation CustomAlertWindow
+ (instancetype)aletWindowWithPositionOption:(AlertWindowPositionOption)positionType andInfoText:(NSString *)text {
return [[CustomAlertWindow alloc] initWithPositionOption:positionType andInfoText:text];
}
- (instancetype)initWithPositionOption:(AlertWindowPositionOption)positionType andInfoText:(NSString *)text {
self = [super init];
if (self) {
UILabel *infoLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 40, 15)];
infoLabel.text = text;
infoLabel.textAlignment = NSTextAlignmentCenter;
infoLabel.font = [UIFont systemFontOfSize:13];
infoLabel.textColor = [UIColor whiteColor];
//label尺寸适应文字大小
[infoLabel sizeToFit];
//根据labelSize确定window的大小
CGSize labelSize = infoLabel.frame.size;
CGSize windowSize = CGSizeMake(labelSize.width + 2*LABEL_MARGIN, labelSize.height + 2*LABEL_MARGIN);
//根据window的尺寸确定label的中心点位置
infoLabel.center = CGPointMake(windowSize.width / 2, windowSize.height / 2);
//得到屏幕的尺寸
CGRect superRect = [[UIScreen mainScreen] bounds];
CGSize superSize = superRect.size;
//计算window的大小
self.frame = CGRectMake((superSize.width - windowSize.width) / 2, 0, windowSize.width, windowSize.height);
//根据指定的positionType设置window的center
switch (positionType) {
case AlertWindowPositionTopMiddle:
self.center = CGPointMake(superSize.width / 2, CENTER_Y_TO_EDGE);
break;
case AlertWindowPositionCenter:
self.center = CGPointMake(superSize.width / 2, superSize.height / 2);
break;
case AlertWindowPositionBottomMiddle:
self.center = CGPointMake(superSize.width / 2, superSize.height - CENTER_Y_TO_EDGE);
break;
default:
break;
}
self.windowLevel = UIWindowLevelAlert + 1;
self.backgroundColor = [UIColor colorWithRed:64 / 255.0 green:64 / 255.0 blue:64 / 255.0 alpha:0.7];
self.layer.cornerRadius = 5;
[self addSubview:infoLabel];
}
return self;
}
//显示window
- (void)show {
[self makeKeyAndVisible];
}
//window消失
- (void)dismiss {
[self resignKeyWindow];
}
@end
step3：调用的时候可以这样处理：
#import "ViewController.h"
#import "CustomAlertWindow.h"
@interface ViewController ()
@property (nonatomic, strong) CustomAlertWindow *alertWindow;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
}
- (IBAction)displayFloatingWindow:(id)sender {
self.alertWindow = [CustomAlertWindow aletWindowWithPositionOption:AlertWindowPositionCenter andInfoText:@"网络不给力"];
[self.alertWindow show];
//设置定时器使之消失
[NSTimer scheduledTimerWithTimeInterval:4.0 target:self selector:@selector(resignWindow) userInfo:nil repeats:NO];
}
- (void)resignWindow {
[self.alertWindow dismiss];
//需要消失的时候不要忘了赋值nil
self.alertWindow = nil;
}
@end
