最近因为项目需要，要实现一种导航栏提示的功能，为了偷懒就到网上搜索了下类似功能，后来发现不太好用，尤其是window.rootViewController改变后，加载在window上的提示窗就不会出现了，所以重点就是如何保证window的根视图切换还能够让弹窗出现。以下是自己整理的类似QQ导航提示效果，以及仿安卓toast效果，现在分享出来，欢迎大家批评指正。
仅需要两行代码搞定自己想要的效果，简单实用，直接上正餐：
SYToastView.h
//
// SYToastView.h
// SYToastView
//
// Created by 紫竹 on 2017/7/14.
// Copyright © 2017年 CSY. All rights reserved.
//
#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>
@interface SYToastView : NSObject
/*** 显示导航栏提醒 ***/
-(void)showNaviString:(NSString*)string;
/*** 导航点击事件 ***/
-(void)addTarget:(id)target action:(SEL)action;
/*** 底部toast 默认时间显示为3s ***/
+(void)showToastString:(NSString *)string;
/*** 底部toast 自定义显示时间***/
+ (void)showToastString:(NSString *)string showTime:(float)showTime;
@end
@interface ToastView : UILabel
+(ToastView*) sharedToastView;
@end
@interface CSYToastLabel : UILabel
+(CSYToastLabel*) sharedCSYToastLabel;
@end
SYToastView.m
//
// SYToastView.m
// SYToastView
//
// Created by 紫竹 on 2017/7/14.
// Copyright © 2017年 CSY. All rights reserved.
//
#import "SYToastView.h"
#define SCREEN_WIDTH ([UIScreen mainScreen].bounds.size.width)
#define SCREEN_HEIGHT ([UIScreen mainScreen].bounds.size.height)
@interface SYToastView ()
@property (nonatomic,assign)id target;
@property (nonatomic,assign)SEL action;
@property (nonatomic,strong)ToastView * toastView;
@end
@implementation SYToastView
/*** 显示导航栏提醒 ***/
-(void)showNaviString:(NSString *)string{
if (![[NSThread currentThread] isMainThread]) {
dispatch_async(dispatch_get_main_queue(), ^{
[self showNaviString:string];
});
return;
}
self.toastView = [ToastView sharedToastView];
[[UIApplication sharedApplication].keyWindow addSubview:self.toastView];
if (self.toastView.superview != [UIApplication sharedApplication].keyWindow) {
[self.toastView removeFromSuperview];
[[UIApplication sharedApplication].keyWindow addSubview:self.toastView];
}
self.toastView.text = string;
UITapGestureRecognizer * tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(clickToastView)];
[self.self.toastView addGestureRecognizer:tap];
if (!self.toastView.alpha)
{
self.toastView.alpha = 1.f;
CGRect rect = self.toastView.frame;
rect.origin.y = 0;
[UIView animateWithDuration:0.5 animations:^{
self.toastView.frame = rect;
} completion:^(BOOL finished) {
[self performSelector:@selector(hiddenView) withObject:self.toastView afterDelay:2];
}];
}
}
-(void)hiddenView{
CGRect rect = self.toastView.frame;
rect.origin.y = -64;
[UIView animateWithDuration:0.5 delay:0 options:UIViewAnimationOptionCurveEaseIn animations:^{
self.toastView.frame = rect;
} completion:^(BOOL finished) {
self.toastView.alpha = 0.f;
}];
}
/*** 导航点击事件 ***/
-(void)addTarget:(id)target action:(SEL)action{
_target = target;
_action = action;
}
-(void)clickToastView{
[_target performSelector:_action withObject:self];
}
/*** 底部toast 默认时间显示为3s ***/
+(void)showToastString:(NSString *)string{
[self showToastString:string showTime:3.0f];
}
/*** 底部toast 自定义显示时间***/
+ (void)showToastString:(NSString *)string showTime:(float)showTime
{
if (![[NSThread currentThread] isMainThread]) {
dispatch_async(dispatch_get_main_queue(), ^{
[self showToastString:string showTime:showTime];
});
return;
}
UILabel *toastView = [CSYToastLabel sharedCSYToastLabel];
[[UIApplication sharedApplication].keyWindow addSubview:toastView];
if (toastView.superview != [UIApplication sharedApplication].keyWindow) {
[toastView removeFromSuperview];
[[UIApplication sharedApplication].keyWindow addSubview:toastView];
}
CGFloat width = [self stringText:string font:17 isHeightFixed:YES fixedValue:30];
CGFloat height = 30;
if (width > SCREEN_WIDTH - 30) {
width = SCREEN_WIDTH - 30;
height = [self stringText:string font:17 isHeightFixed:NO fixedValue:width];
}
CGRect frame = CGRectMake(([UIScreen mainScreen].bounds.size.width-width-10)/2,SCREEN_HEIGHT, width+10, height);
toastView.text = string;
toastView.font = [UIFont systemFontOfSize:17];
toastView.layer.cornerRadius = height/2;
toastView.layer.masksToBounds = YES;
toastView.layer.borderWidth = 1.0f;
toastView.layer.borderColor = [UIColor redColor].CGColor;
toastView.frame = frame;
[UIView animateWithDuration:0.3 animations:^{
CGRect rect = toastView.frame;
rect.origin.y = SCREEN_HEIGHT-40-rect.size.height;
toastView.frame = rect;
toastView.alpha = 1.0;
} completion:^(BOOL finished) {
[UIView animateWithDuration:showTime animations:^{
toastView.alpha = 0;
}];
}];
}
//根据字符串长度获取对应的宽度或者高度
+ (CGFloat)stringText:(NSString *)text font:(CGFloat)font isHeightFixed:(BOOL)isHeightFixed fixedValue:(CGFloat)fixedValue
{
CGSize size;
if (isHeightFixed) {
size = CGSizeMake(MAXFLOAT, fixedValue);
} else {
size = CGSizeMake(fixedValue, MAXFLOAT);
}
CGSize resultSize;
//返回计算出的size
resultSize = [text boundingRectWithSize:size options:NSStringDrawingTruncatesLastVisibleLine | NSStringDrawingUsesFontLeading | NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName: [UIFont systemFontOfSize:font]} context:nil].size;
if (isHeightFixed) {
return resultSize.width;
} else {
return resultSize.height;
}
}
@end
static ToastView *toastView = nil;
@implementation ToastView
+(ToastView*) sharedToastView{
static dispatch_once_t token;
dispatch_once(&token, ^{
if(toastView == nil)
{
toastView = [[self alloc] initWithFrame:CGRectMake(0, -64, SCREEN_WIDTH, 64)];
toastView.alpha = 0;
toastView.userInteractionEnabled = YES;
toastView.backgroundColor = [UIColor blueColor];
toastView.textColor = [UIColor whiteColor];
toastView.font = [UIFont systemFontOfSize:14];
toastView.textAlignment = NSTextAlignmentCenter;
toastView.numberOfLines = 0;
}
});
return toastView;
}
@end
static CSYToastLabel *toastLabel = nil;
@implementation CSYToastLabel
+(CSYToastLabel*) sharedCSYToastLabel{
static dispatch_once_t token;
dispatch_once(&token, ^{
if(toastLabel == nil)
{
toastLabel = [[self alloc] init];
toastLabel.textColor = [UIColor redColor];
toastLabel.textAlignment = NSTextAlignmentCenter;
toastLabel.alpha = 0;
toastLabel.numberOfLines = 0;
toastLabel.lineBreakMode = NSLineBreakByCharWrapping;
}
});
return toastLabel;
}
@end
引用相当简单，仅需一行代码：
// 导航提示效果
SYToastView * tostV = [[SYToastView alloc]init];
[tostV showNaviString:@"这是导航提示效果"];
// 添加导航效果点击事件
[tostV addTarget:self action:@selector(click)];
// 底部仿安卓toast效果
[SYToastView showToastString:@"默认显示3秒的toast"];
[SYToastView showToastString:@"自定义显示时间的toast" showTime:5.0f];
导航栏提示效果
仿安卓Toast效果
代码示例：
https://github.com/csy0202/SYToastViewDemo/tree/master/SYToastViewDemo
