iOS开发：Toast for iPhone 实例分享

分享一个我写的类似于android的toast的提示框

主要特点：

1，支持屏幕Y轴任意位置显示，设置距离顶/底端距离

2，支持多行文本

3，支持设置等待时间

4，支持点击隐藏，屏幕旋转时自动隐藏，淡入淡出

5，无需初始化，类方法调用

效果图：

全部代码如下，使用时需要添加QuartzCore.framework，希望能给大家带来方便。

 #import <Foundation/Foundation.h>

 #define DEFAULT_DISPLAY_DURATION 2.0f

 @interface OMGToast : NSObject {
     NSString *text;
     UIButton *contentView;
     CGFloat  duration;
 }

 + (void)showWithText:(NSString *) text_;
 + (void)showWithText:(NSString *) text_
             duration:(CGFloat)duration_;

 + (void)showWithText:(NSString *) text_
            topOffset:(CGFloat) topOffset_;
 + (void)showWithText:(NSString *) text_
            topOffset:(CGFloat) topOffset
             duration:(CGFloat) duration_;

 + (void)showWithText:(NSString *) text_
         bottomOffset:(CGFloat) bottomOffset_;
 + (void)showWithText:(NSString *) text_
         bottomOffset:(CGFloat) bottomOffset_
             duration:(CGFloat) duration_;

 @end

 #import "OMGToast.h"
 #import <QuartzCore/QuartzCore.h>

 @interface OMGToast (private)

 - (id)initWithText:(NSString *)text_;
 - (void)setDuration:(CGFloat) duration_;

 - (void)dismisToast;
 - (void)toastTaped:(UIButton *)sender_;

 - (void)showAnimation;
 - (void)hideAnimation;

 - (void)show;
 - (void)showFromTopOffset:(CGFloat) topOffset_;
 - (void)showFromBottomOffset:(CGFloat) bottomOffset_;

 @end


 @implementation OMGToast

 - (void)dealloc{
     [[NSNotificationCenter defaultCenter] removeObserver:self
                                                     name:UIDeviceOrientationDidChangeNotification
                                                   object:[UIDevice currentDevice]];
     [contentView release],contentView = nil;
     [text release],text = nil;
     [super dealloc];
 }


 - (id)initWithText:(NSString *)text_{
     if (self = [super init]) {

         text = [text_ copy];

         UIFont *font = [UIFont boldSystemFontOfSize:14];
         CGSize textSize = [text sizeWithFont:font
                            constrainedToSize:CGSizeMake(280, MAXFLOAT)
                                lineBreakMode:UILineBreakModeWordWrap];

         UILabel *textLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, textSize.width + 12, textSize.height + 12)];
         textLabel.backgroundColor = [UIColor clearColor];
         textLabel.textColor = [UIColor whiteColor];
         textLabel.textAlignment = UITextAlignmentCenter;
         textLabel.font = font;
         textLabel.text = text;
         textLabel.numberOfLines = 0;

         contentView = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, textLabel.frame.size.width, textLabel.frame.size.height)];
         contentView.layer.cornerRadius = 5.0f;
         contentView.layer.borderWidth = 1.0f;
         contentView.layer.borderColor = [[UIColor grayColor] colorWithAlphaComponent:0.5].CGColor;
         contentView.backgroundColor = [UIColor colorWithRed:0.2f
                                                       green:0.2f
                                                        blue:0.2f
                                                       alpha:0.75f];
         [contentView addSubview:textLabel];
         contentView.autoresizingMask = UIViewAutoresizingFlexibleWidth;
         [contentView addTarget:self
                         action:@selector(toastTaped:)
               forControlEvents:UIControlEventTouchDown];
         contentView.alpha = 0.0f;
         [textLabel release];

         duration = DEFAULT_DISPLAY_DURATION;

         [[NSNotificationCenter defaultCenter] addObserver:self
                                                  selector:@selector(deviceOrientationDidChanged:)
                                                      name:UIDeviceOrientationDidChangeNotification
                                                    object:[UIDevice currentDevice]];
     }
     return self;
 }

 - (void)deviceOrientationDidChanged:(NSNotification *)notify_{
     [self hideAnimation];
 }

 -(void)dismissToast{
     [contentView removeFromSuperview];
 }

 -(void)toastTaped:(UIButton *)sender_{
     [self hideAnimation];
 }

 - (void)setDuration:(CGFloat) duration_{
     duration = duration_;
 }

 -(void)showAnimation{
     [UIView beginAnimations:@"show" context:NULL];
     [UIView setAnimationCurve:UIViewAnimationCurveEaseIn];
     [UIView setAnimationDuration:0.3];
     contentView.alpha = 1.0f;
     [UIView commitAnimations];
 }

 -(void)hideAnimation{
     [UIView beginAnimations:@"hide" context:NULL];
     [UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
     [UIView setAnimationDelegate:self];
     [UIView setAnimationDidStopSelector:@selector(dismissToast)];
     [UIView setAnimationDuration:0.3];
     contentView.alpha = 0.0f;
     [UIView commitAnimations];
 }

 - (void)show{
     UIWindow *window = [UIApplication sharedApplication].keyWindow;
     contentView.center = window.center;
     [window  addSubview:contentView];
     [self showAnimation];
     [self performSelector:@selector(hideAnimation) withObject:nil afterDelay:duration];
 }

 - (void)showFromTopOffset:(CGFloat) top_{
     UIWindow *window = [UIApplication sharedApplication].keyWindow;
     contentView.center = CGPointMake(window.center.x, top_ + contentView.frame.size.height/2);
     [window  addSubview:contentView];
     [self showAnimation];
     [self performSelector:@selector(hideAnimation) withObject:nil afterDelay:duration];
 }

 - (void)showFromBottomOffset:(CGFloat) bottom_{
     UIWindow *window = [UIApplication sharedApplication].keyWindow;
     contentView.center = CGPointMake(window.center.x, window.frame.size.height-(bottom_ + contentView.frame.size.height/2));
     [window  addSubview:contentView];
     [self showAnimation];
     [self performSelector:@selector(hideAnimation) withObject:nil afterDelay:duration];
 }


 + (void)showWithText:(NSString *)text_{
     [OMGToast showWithText:text_ duration:DEFAULT_DISPLAY_DURATION];
 }

 + (void)showWithText:(NSString *)text_
             duration:(CGFloat)duration_{
     OMGToast *toast = [[[OMGToast alloc] initWithText:text_] autorelease];
     [toast setDuration:duration_];
     [toast show];
 }

 + (void)showWithText:(NSString *)text_
            topOffset:(CGFloat)topOffset_{
     [OMGToast showWithText:text_  topOffset:topOffset_ duration:DEFAULT_DISPLAY_DURATION];
 }

 + (void)showWithText:(NSString *)text_
            topOffset:(CGFloat)topOffset_
             duration:(CGFloat)duration_{
     OMGToast *toast = [[[OMGToast alloc] initWithText:text_] autorelease];
     [toast setDuration:duration_];
     [toast showFromTopOffset:topOffset_];
 }

 + (void)showWithText:(NSString *)text_
            bottomOffset:(CGFloat)bottomOffset_{
     [OMGToast showWithText:text_  bottomOffset:bottomOffset_ duration:DEFAULT_DISPLAY_DURATION];
 }

 + (void)showWithText:(NSString *)text_
         bottomOffset:(CGFloat)bottomOffset_
             duration:(CGFloat)duration_{
     OMGToast *toast = [[[OMGToast alloc] initWithText:text_] autorelease];
     [toast setDuration:duration_];
     [toast showFromBottomOffset:bottomOffset_];
 }

 @end

可以这样来使用

 [OMGToast showWithText:@"中间显示" duration:5];
 [OMGToast showWithText:@"距离上方50像素" topOffset:50 duration:5];
 [OMGToast showWithText:@"文字很多的时候，我就会自动折行，最大宽度280像素" topOffset:100 duration:5];
 [OMGToast showWithText:@"加入\\n也可以\n显示\n多\n行" topOffset:300 duration:5];
 [OMGToast showWithText:@"距离下方3像素" bottomOffset:3 duration:5];