iOS Toast提示视图实现-优快云博客

// ToastUtils.h

// vsfa

// Created by long on 15/7/29.

#import <Foundation/Foundation.h>

#import <UIKit/UIKit.h>

#define ShowToastAtTop(format, ...) \

[ToastUtils showAtTop:[NSString stringWithFormat:format, ## __VA_ARGS__]]

#define ShowToast(format, ...) \

[ToastUtils show:[NSString stringWithFormat:format, ## __VA_ARGS__]]

#define ShowToastLongAtTop(format, ...) \

[ToastUtils showLongAtTop:[NSString stringWithFormat:format, ## __VA_ARGS__]]

#define ShowToastLong(format, ...) \

[ToastUtils showLong:[NSString stringWithFormat:format, ## __VA_ARGS__]]

@interface ToastUtils : NSObject

//显示提示视图, 默认显示在屏幕上方，防止被软键盘覆盖，1.5s后自动消失

+ (void)showAtTop:(NSString *)message;

//显示提示视图, 默认显示在屏幕下方，1.5s后自动消失

+ (void)show:(NSString *)message;

//显示提示视图, 默认显示在屏幕上方，防止被软键盘覆盖,3s后自动消失

+ (void)showLongAtTop:(NSString *)message;

//显示提示视图, 默认显示在屏幕下方,3s后自动消失

+ (void)showLong:(NSString *)message;

@end

// 版权属于原作者

// http://code4app.com (cn) http://code4app.net (en)

// 发布代码于最专业的源码分享网站: Code4App.com

// ToastUtils.m

// vsfa

// Created by long on 15/7/29.

#import "ToastUtils.h"

#import "ZLDefine.h"

@implementation ToastUtils

#pragma mark - 显示提示视图

+ (void)showAtTop:(NSString *)message

{

[self show:message atTop:YES showTime:2.0];

}

+ (void)show:(NSString *)message

{

[self show:message atTop:NO showTime:2.0];

}

+ (void)showLongAtTop:(NSString *)message

{

[self show:message atTop:YES showTime:4.0];

}

+ (void)showLong:(NSString *)message

{

[self show:message atTop:NO showTime:4.0];

}

static UILabel *toastView = nil;

+ (void)show:(NSString *)message atTop:(BOOL)atTop showTime:(float)showTime

{

if (![[NSThread currentThread] isMainThread]) {

dispatch_async(dispatch_get_main_queue(), ^{

[self show:message atTop:atTop showTime:showTime];

});

return;

}

@synchronized(self){

if (toastView == nil) {

toastView = [[UILabel alloc] init];

toastView.backgroundColor = [UIColor darkGrayColor];

toastView.textColor = [UIColor whiteColor];

toastView.font = [UIFont systemFontOfSize:17];

toastView.layer.masksToBounds = YES;

toastView.layer.cornerRadius = 3.0f;

toastView.textAlignment = NSTextAlignmentCenter;

toastView.alpha = 0;

toastView.numberOfLines = 0;

toastView.lineBreakMode = NSLineBreakByCharWrapping;

[[UIApplication sharedApplication].keyWindow addSubview:toastView];

}

if (toastView.superview != [UIApplication sharedApplication].keyWindow) {

[toastView removeFromSuperview];

[[UIApplication sharedApplication].keyWindow addSubview:toastView];

}

// CGFloat screenWidth = [[UIScreen mainScreen] bounds].size.width;

CGFloat width = [self stringText:message font:18 isHeightFixed:YES fixedValue:30];

CGFloat height = 30;

if (width > screenWidth - 20) {

width = screenWidth - 20;

height = [self stringText:message font:18 isHeightFixed:NO fixedValue:width];

}

CGRect frame = CGRectMake(([UIScreen mainScreen].bounds.size.width-width)/2, atTop?[UIScreen mainScreen].bounds.size.height*0.15:[UIScreen mainScreen].bounds.size.height*0.85, width, height);

toastView.alpha = 1;

toastView.text = message;

toastView.frame = frame;

[UIView animateWithDuration:showTime animations:^{

toastView.alpha = 0;

} completion:^(BOOL finished) {

}];

}

//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;