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];