IOS Toast

iOS的风格和Apple其他产品一样，简单而粗暴。没有给人其他选择的余地，让你又爱又恨。同样的，Apple对待iOS平台的开发人员和对待大众消费者一样，也不给你留余地。UIAlertView就是一个鲜明标志。功能简单，甚至单一，定制性差，消耗资源。在资源紧张的设备上，UIAlertView的动画效果都会稍微卡一下，很是别扭。

这时还是很希望在iOS上有一个Android风格的Toast控件。

终于http://code.google.com/p/toast-notifications-ios/ 发布了这样的控件。在这里和大家分享一下。

我制作了一个demo，使用起来感觉效果还是很不错的。

这个类的接口设计如下.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,

iToastTypeNone // For internal use only (to force no image)

}iToastType;

@class iToastSettings;

@interface iToast : NSObject {

iToastSettings *_settings;

NSInteger offsetLeft;

NSInteger offsetTop;

NSTimer *timer;

UIView *view;

NSString *text;

}

- (void) show;

- (void) show:(iToastType) type;

- (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

===============================================

.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 = [superinit]) {

text = [tex copy];

}

return self;

}

- (void) show{

[selfshow:iToastTypeNone];

}

- (void) show:(iToastType) type{

iToastSettings *theSettings =_settings;

if (!theSettings) {

theSettings = [iToastSettingsgetSharedSettings];

}

UIImage *image = [theSettings.imagesvalueForKey:[NSString stringWithFormat:@"%i", type]];

UIFont *font = [UIFontsystemFontOfSize:16];

CGSize textSize = [textsizeWithFont:font constrainedToSize:CGSizeMake(280,60)];

UILabel *label = [[UILabelalloc] initWithFrame:CGRectMake(0,0, textSize.width + 5, textSize.height + 5)];

label.backgroundColor = [UIColorclearColor];

label.textColor = [UIColorwhiteColor];

label.font = font;

label.text = text;

label.numberOfLines =0;

label.shadowColor = [UIColordarkGrayColor];

label.shadowOffset = CGSizeMake(1, 1);

UIButton *v = [UIButtonbuttonWithType:UIButtonTypeCustom];

if (image) {

v.frame = CGRectMake(0, 0, image.size.width + textSize.width +15, MAX(textSize.height, image.size.height) +10);

label.center = CGPointMake(image.size.width +10 + (v.frame.size.width - image.size.width -10) / 2, v.frame.size.height /2);

} else {

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];

[label release];

if (image) {

UIImageView *imageView = [[UIImageViewalloc] initWithImage:image];

imageView.frame =CGRectMake(5, (v.frame.size.height - image.size.height)/2, image.size.width, image.size.height);

[v addSubview:imageView];

[imageView release];

}

v.backgroundColor = [UIColorcolorWithRed:0green:0 blue:0 alpha:0.7];

v.layer.cornerRadius =5;

UIWindow *window = [[[UIApplicationsharedApplication] windows] objectAtIndex:0];

CGPoint point = CGPointMake(window.frame.size.width/2, window.frame.size.height/2);

// Set correct orientation/location regarding device orientation

UIInterfaceOrientation orientation = (UIInterfaceOrientation)[[UIApplicationsharedApplication] statusBarOrientation];

switch (orientation) {

caseUIDeviceOrientationPortrait:

{

if (theSettings.gravity ==iToastGravityTop) {

point = CGPointMake(window.frame.size.width /2, 45);

} elseif (theSettings.gravity == iToastGravityBottom) {

point = CGPointMake(window.frame.size.width /2, window.frame.size.height -45);

} elseif (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);

break;

}

caseUIDeviceOrientationPortraitUpsideDown:

{

v.transform =CGAffineTransformMakeRotation(M_PI);

float width = window.frame.size.width;

float height = window.frame.size.height;

if (theSettings.gravity ==iToastGravityTop) {

point = CGPointMake(width / 2, height - 45);

} elseif (theSettings.gravity == iToastGravityBottom) {

point = CGPointMake(width / 2, 45);

} elseif (theSettings.gravity == iToastGravityCenter) {

point = CGPointMake(width/2, height/2);

} else {

// TODO : handle this case

point = theSettings.postition;

}

point = CGPointMake(point.x -offsetLeft, point.y - offsetTop);

break;

}

caseUIDeviceOrientationLandscapeLeft:

{

v.transform =CGAffineTransformMakeRotation(M_PI/2);//rotation in radians

if (theSettings.gravity ==iToastGravityTop) {

point = CGPointMake(window.frame.size.width -45, window.frame.size.height /2);

} elseif (theSettings.gravity == iToastGravityBottom) {

point = CGPointMake(45,window.frame.size.height /2);

} elseif (theSettings.gravity == iToastGravityCenter) {

point = CGPointMake(window.frame.size.width/2, window.frame.size.height/2);

} else {

// TODO : handle this case

point = theSettings.postition;

}

point = CGPointMake(point.x -offsetTop, point.y - offsetLeft);

break;

}

caseUIDeviceOrientationLandscapeRight:

{

v.transform =CGAffineTransformMakeRotation(-M_PI/2);

if (theSettings.gravity ==iToastGravityTop) {

point = CGPointMake(45, window.frame.size.height /2);

} elseif (theSettings.gravity == iToastGravityBottom) {

point = CGPointMake(window.frame.size.width -45, window.frame.size.height/2);

} elseif (theSettings.gravity == iToastGravityCenter) {

point = CGPointMake(window.frame.size.width/2, window.frame.size.height/2);

} else {

// TODO : handle this case

point = theSettings.postition;

}

point = CGPointMake(point.x +offsetTop, point.y + offsetLeft);

break;

}

default:

break;

}

v.center = point;

NSTimer *timer1 = [NSTimertimerWithTimeInterval:((float)theSettings.duration)/1000 

target:selfselector:@selector(hideToast:) 

 userInfo:nil repeats:NO];

[[NSRunLoop mainRunLoop] addTimer:timer1forMode:NSDefaultRunLoopMode];

[window addSubview:v];

view = [v retain];

[v addTarget:selfaction:@selector(hideToast:)forControlEvents:UIControlEventTouchDown];

}

- (void) hideToast:(NSTimer*)theTimer{

[UIViewbeginAnimations:nilcontext:NULL];

view.alpha =0;

[UIViewcommitAnimations];

NSTimer *timer2 = [NSTimertimerWithTimeInterval:500 

target:selfselector:@selector(hideToast:) 

 userInfo:nil repeats:NO];

[[NSRunLoop mainRunLoop] addTimer:timer2forMode:NSDefaultRunLoopMode];

}

- (void) removeToast:(NSTimer*)theTimer{

[viewremoveFromSuperview];

}

+ (iToast *) makeText:(NSString *) _text{

iToast *toast = [[[iToastalloc] 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 = [[iToastSettingsgetSharedSettings] copy];

}

return_settings;

}

@end

@implementation iToastSettings

@synthesize duration;

@synthesize gravity;

@synthesize postition;

@synthesize images;

- (void) setImage:(UIImage *) img forType:(iToastType) type{

if (type == iToastTypeNone) {

// This should not be used, internal use only (to force no image)

return;

}

if (!images) {

images = [[NSMutableDictionaryalloc] initWithCapacity:4];

}

if (img) {

NSString *key = [NSStringstringWithFormat:@"%i", type];

[images setValue:img forKey:key];

}

}

+ (iToastSettings *) getSharedSettings{

if (!sharedSettings) {

sharedSettings = [iToastSettingsnew];

sharedSettings.gravity =iToastGravityCenter;

sharedSettings.duration =iToastDurationShort;

}

returnsharedSettings;

}

- (id) copyWithZone:(NSZone *)zone{

iToastSettings *copy = [iToastSettingsnew];

copy.gravity =self.gravity;

copy.duration =self.duration;

copy.postition =self.postition;

NSArray *keys = [self.imagesallKeys];

for (NSString *keyin keys){

[copy setImage:[imagesvalueForKey:key] forType:[key intValue]];

}

return copy;

}

@end

从接口上看，可以设置风格和显示时间，显示位置等，但是从实现代码上看是图片显示只是预留的接口，尚未实现。其显示的位置在设备旋转时也没有进行处理，没有进行横屏等其他方向的显示控制。 

 

简单的调用

[[iToast makeText:NSLocalizedString(@"The activity has been successfully saved.",@"")] show];

 

设置显示位置

[[[iToast makeText:NSLocalizedString(@"The activity has been successfully saved.", @"")] setGravity:iToastGravityBottom] show];

 

设置显示位置和显示时长类型

[[[[iToast makeText:NSLocalizedString(@"Something to display a very long time",@"")] setGravity:iToastGravityBottom] setDuration:iToastDurationLong] show];