学步园

//iToast.h

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>

typedef enum iToastGravity {
	iToastGravityTop = 1000001,
	iToastGravityBottom,
	iToastGravityCenter
}iToastGravity;

enum iToastDuration {
	iToastDurationLong = 10000,
	iToastDurationShort = 1000,
	iToastDurationNormal = 3000
}iToastDuration;

typedef enum iToastType {
	iToastTypeInfo = -100000,
	iToastTypeNotice,
	iToastTypeWarning,
	iToastTypeError
}iToastType;


@class iToastSettings;

@interface iToast : NSObject {
	iToastSettings *_settings;
	NSInteger offsetLeft;
	NSInteger offsetTop;
	
	NSTimer *timer;
	
	UIView *view;
	NSString *text;
}

- (void) show;

- (iToast *) setDuration:(NSInteger ) duration;
- (iToast *) setGravity:(iToastGravity) gravity 
			 offsetLeft:(NSInteger) left
              offsetTop:(NSInteger) top;
- (iToast *) setGravity:(iToastGravity) gravity;
- (iToast *) setPostion:(CGPoint) position;

+ (iToast *) makeText:(NSString *) text;

-(iToastSettings *) theSettings;

@end



@interface iToastSettings : NSObject<NSCopying>{
	NSInteger duration;
	iToastGravity gravity;
	CGPoint postition;
	iToastType toastType;
	
	NSDictionary *images;
	
	BOOL positionIsSet;
}


@property(assign) NSInteger duration;
@property(assign) iToastGravity gravity;
@property(assign) CGPoint postition;
@property(readonly) NSDictionary *images;


- (void) setImage:(UIImage *)img forType:(iToastType) type;
+ (iToastSettings *) getSharedSettings;

@end

//iToast.m

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

static iToastSettings *sharedSettings = nil;

@interface iToast(private)

- (iToast *) settings;

@end


@implementation iToast


- (id) initWithText:(NSString *) tex{
	if (self = [super init]) {
		text = [tex copy];
	}
	
	return self;
}

- (void) show{
	
	iToastSettings *theSettings = _settings;
	
	if (!theSettings) {
		theSettings = [iToastSettings getSharedSettings];
	}
	
	UIFont *font = [UIFont systemFontOfSize:16];
	CGSize textSize = [text sizeWithFont:font constrainedToSize:CGSizeMake(280, 60)];
	
	UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, textSize.width + 5, textSize.height + 5)];
	label.backgroundColor = [UIColor clearColor];
	label.textColor = [UIColor whiteColor];
	label.font = font;
	label.text = text;
	label.numberOfLines = 0;
	label.shadowColor = [UIColor darkGrayColor];
	label.shadowOffset = CGSizeMake(1, 1);
	
	UIButton *v = [UIButton buttonWithType:UIButtonTypeCustom];
	v.frame = CGRectMake(0, 0, textSize.width + 10, textSize.height + 10);
	label.center = CGPointMake(v.frame.size.width / 2, v.frame.size.height / 2);
	[v addSubview:label];
	
	v.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.7];
	v.layer.cornerRadius = 5;
	
	UIWindow *window = [[[UIApplication sharedApplication] windows] objectAtIndex:0];
	
	CGPoint point = CGPointMake(window.frame.size.width/2, window.frame.size.height/2);
	
	if (theSettings.gravity == iToastGravityTop) {
		point = CGPointMake(window.frame.size.width / 2, 45);
	}else if (theSettings.gravity == iToastGravityBottom) {
		point = CGPointMake(window.frame.size.width / 2, window.frame.size.height - 45);
	}else if (theSettings.gravity == iToastGravityCenter) {
		point = CGPointMake(window.frame.size.width/2, window.frame.size.height/2);
	}else{
		point = theSettings.postition;
	}
	
	point = CGPointMake(point.x + offsetLeft, point.y + offsetTop);
	v.center = point;
	
	NSTimer *timer1 = [NSTimer 
					   timerWithTimeInterval:((float)theSettings.duration)/1000 
					   target:self 
					   selector:@selector(hideToast:) 
					   userInfo:nil 
					   repeats:NO];
	[[NSRunLoop mainRunLoop] addTimer:timer1 forMode:NSDefaultRunLoopMode];
	
	[window addSubview:v];
	
	view = [v retain];
	
	[v addTarget:self action:@selector(hideToast:) forControlEvents:UIControlEventTouchDown];
}

- (void) hideToast:(NSTimer*)theTimer{
	[UIView beginAnimations:nil context:NULL];
	view.alpha = 0;
	[UIView commitAnimations];
	
	NSTimer *timer2 = [NSTimer 
					   timerWithTimeInterval:500 
					   target:self 
					   selector:@selector(hideToast:) 
					   userInfo:nil 
					   repeats:NO];
	[[NSRunLoop mainRunLoop] addTimer:timer2 forMode:NSDefaultRunLoopMode];
}

- (void) removeToast:(NSTimer*)theTimer{
	[view removeFromSuperview];
}


+ (iToast *) makeText:(NSString *) _text{
	iToast *toast = [[[iToast alloc] initWithText:_text] autorelease];
	
	return toast;
}


- (iToast *) setDuration:(NSInteger ) duration{
	[self theSettings].duration = duration;
	return self;
}

- (iToast *) setGravity:(iToastGravity) gravity 
			 offsetLeft:(NSInteger) left
			  offsetTop:(NSInteger) top{
	[self theSettings].gravity = gravity;
	offsetLeft = left;
	offsetTop = top;
	return self;
}

- (iToast *) setGravity:(iToastGravity) gravity{
	[self theSettings].gravity = gravity;
	return self;
}

- (iToast *) setPostion:(CGPoint) _position{
	[self theSettings].postition = CGPointMake(_position.x, _position.y);
	
	return self;
}

-(iToastSettings *) theSettings{
	if (!_settings) {
		_settings = [[iToastSettings getSharedSettings] copy];
	}
	
	return _settings;
}

@end


@implementation iToastSettings
@synthesize duration;
@synthesize gravity;
@synthesize postition;
@synthesize images;

- (void) setImage:(UIImage *) img forType:(iToastType) type{
	if (!images) {
		images = [[NSMutableDictionary alloc] initWithCapacity:4];
	}
	
	if (img) {
		NSString *key = [NSString stringWithFormat:@"%i", type];
		[images setValue:img forKey:key];
	}
}


+ (iToastSettings *) getSharedSettings{
	if (!sharedSettings) {
		sharedSettings = [iToastSettings new];
		sharedSettings.gravity = iToastGravityCenter;
		sharedSettings.duration = iToastDurationShort;
	}
	
	return sharedSettings;
	
}

- (id) copyWithZone:(NSZone *)zone{
	iToastSettings *copy = [iToastSettings new];
	copy.gravity = self.gravity;
	copy.duration = self.duration;
	copy.postition = self.postition;
	
	NSArray *keys = [self.images allKeys];
	
	for (NSString *key in keys){
		[copy setImage:[images valueForKey:key] forType:[key intValue]];
	}
	
	return copy;
}

@end




调用：

[[iToast makeText:@"需要显示的内容"] show];
转自：http://www.devdiv.com/home.php?mod=space&uid=32433&do=blog&id=11602