在iOS开发中不可避免的会用到一些第三方类库,它们提供了很多实用的功能,使我们的开发变得更有效率;同时,也可以从它们的源代码中学习到很多有用的东西。
用来检查网络连接是否可用:包括WIFI和WWAN(3G/EDGE/CDMA等)两种工作模式。
可以从Apple网站下载到: http://developer.apple.com/library/ios/#samplecode/Reachability/History/History.html#//apple_ref/doc/uid/DTS40007324-RevisionHistory-DontLinkElementID_1。
现在有更好的替代品:https://github.com/tonymillion/Reachability,比Apple提供的兼容性更好,而且更加好用,更具体的使用方法请看它提供的例子。
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Reachability* reach = [Reachability reachabilityWithHostname:@"www.google.com"];
reach.reachableBlock = ^(Reachability*reach) {
NSLog(@"网络可用!");
};
reach.unreachableBlock = ^(Reachability*reach) {
NSLog(@"网络不可用!");
};
// 开始监听
[reach startNotifier];
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ASIHTTPRequest是对CFNetwork API的一个包装,它提供了一套更加简洁的API,使用起来也更加简单。
官方网站:http://allseeing-i.com/ASIHTTPRequest/
GitHub:https://github.com/pokeb/asi-http-request
它不仅仅支持基本的HTTP请求,而且支持基于REST的服务(GET/POST/PUT/DELETE)。
最让人喜欢的是,它支持block语法:
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NSURL *url = [NSURL URLWithString:@"
http://allseeing-i.com
"];
__block ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
[request setCompletionBlock:^{
// Use when fetching text data
NSString *responseString = [request responseString];
// Use when fetching binary data
NSData *responseData = [request responseData];
}];
[request setFailedBlock:^{
NSError *error = [request error];
}];
[request startAsynchronous];
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它的ASIFormDataRequest子类可以横容易的提交表单数据和文件:
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ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:url];
[request setPostValue:@"Ben" forKey:@"first_name"];
[request setPostValue:@"Copsey" forKey:@"last_name"];
// Upload a file on disk
[request setFile:@"/Users/ben/Desktop/ben.jpg" withFileName:@"myphoto.jpg" andContentType:@"image/jpeg"
forKey:@"photo"];
// Upload an NSData instance
[request setData:imageData withFileName:@"myphoto.jpg" andContentType:@"image/jpeg" forKey:@"photo"];
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详细的使用方法请下载相应的源代码及例子,或者从官方的使用说明http://allseeing-i.com/ASIHTTPRequest/How-to-use开始。
支持各种状态加载的提示效果,以及带进度的提示效果。
GitHub:https://github.com/matej/MBProgressHUD
一般会在.m文件实现MBProgressHUDDelegate协议,并声明HUD变量:
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@interface SampleViewController ()<MBProgressHUDDelegate>
{
MBProgressHUD *HUD;
}
#pragma mark -
#pragma mark MBProgressHUDDelegate methods
- (void)hudWasHidden:(MBProgressHUD *)hud {
// Remove HUD from screen when the HUD was hidded
[HUD removeFromSuperview];
HUD = nil;
}
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在执行某个异步请求时开始调用:
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HUD = [MBProgressHUD showHUDAddedTo:self.webView animated:YES];
HUD.labelText = @"正在请求...";
// mode参数可以控制显示的模式
//HUD.mode = MBProgressHUDModeText;
HUD.delegate = self;
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请求完成时隐藏提示效果:
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[HUD hide:YES];
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对于同步方法一般都是用showWhileExecuting方法,方法执行完成之后会自动隐藏提示效果:
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[HUD showWhileExecuting:@selector(myTask) onTarget:self withObject:nil animated:YES];
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GitHub:https://github.com/samvermette/SVProgressHUD
SVProgressHUD和MBProgressHUD效果差不多,不过不需要使用协议,同时也不需要声明实例。
直接通过类方法进行调用即可:
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[SVProgressHUD method]
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可以使用以下方法来显示状态:
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+ (void)show;
+ (void)showWithMaskType:(SVProgressHUDMaskType)maskType;
+ (void)showWithStatus:(NSString*)string;
+ (void)showWithStatus:(NSString*)string maskType:(SVProgressHUDMaskType)maskType;
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如果需要明确的进度,则使用以下方法:
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+ (void)showProgress:(CGFloat)progress;
+ (void)showProgress:(CGFloat)progress status:(NSString*)status;
+ (void)showProgress:(CGFloat)progress status:(NSString*)status maskType:(SVProgressHUDMaskType)maskType;
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通过dismiss方法来隐藏提示:
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+ (void)dismiss;
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另外提供了以下方法用于显示状态,并在1秒后自动隐藏提示(使用的图标来源于Glyphish:http://www.glyphish.com/):
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+ (void)showSuccessWithStatus:(NSString*)string;
+ (void)showErrorWithStatus:(NSString *)string;
+ (void)showImage:(UIImage*)image status:(NSString*)string;// use 28x28 white pngs
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GitHub:https://github.com/zacaltman/ZAActivityBar
ZAActivityBar和SVProgressHUD非常相似,它提供了更加简洁的API来显示提示效果。
ZAActivityBar使用的动画效果来源于ZKBounceAnimation(https://github.com/khanlou/SKBounceAnimation),成功、失败的状态图标来源于Pictos(http://pictos.cc/)。
显示加载状态:
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[ZAActivityBar showWithStatus:@"加载中..."];
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显示成功、失败状态:
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[ZAActivityBar showSuccessWithStatus:@"成功!"];
[ZAActivityBar showErrorWithStatus:@"失败!"];
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隐藏提示:
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[ZAActivityBar dismiss];
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官方: http://sbjson.org/
GitHub:https://github.com/stig/json-framework
API使用起来稍显繁琐,特别是初始化的时候:
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@interface TestViewController ()<SBJsonStreamParserAdapterDelegate> {
SBJsonStreamParser *parser;
SBJsonStreamParserAdapter *adapter;
}
// 冗长的初始化方法足以吓到一大片人
- (void)initSBJSON
{
// We don't want *all* the individual messages from the
// SBJsonStreamParser, just the top-level objects. The stream
// parser adapter exists for this purpose.
adapter = [[SBJsonStreamParserAdapter alloc] init];
// Set ourselves as the delegate, so we receive the messages
// from the adapter.
adapter.delegate = self;
// Create a new stream parser..
parser = [[SBJsonStreamParser alloc] init];
// .. and set our adapter as its delegate.
parser.delegate = adapter;
// Normally it's an error if JSON is followed by anything but
// whitespace. Setting this means that the parser will be
// expecting the stream to contain multiple whitespace-separated
// JSON documents.
parser.supportMultipleDocuments = YES;
}
#pragma mark SBJsonStreamParserAdapterDelegate methods
- (void)parser:(SBJsonStreamParser *)parser foundArray:(NSArray *)array {
[NSExceptionraise:@"unexpected" format:@"Should not get here"];
}
- (void)parser:(SBJsonStreamParser *)parser foundObject:(NSDictionary *)dict {
NSLog(@"SBJson parser foundObject");
// 处理返回的数据
}
// 使用ASIHTTPRequest请求测试
- (void) loadData {
__block ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
[request setRequestMethod:@"POST"];
[request setCompletionBlock:^{
// Use when fetching text data
//NSString *responseString = [request responseString];
// Use when fetching binary data
NSData *responseData = [request responseData];
NSLog(@"Connection didReceiveData of length: %u", responseData.length);
// Parse the new chunk of data. The parser will append it to
// its internal buffer, then parse from where it left off in
// the last chunk.
SBJsonStreamParserStatus status = [parser parse:responseData];
if (status == SBJsonStreamParserError) {
NSLog(@"Parser error: %@", parser.error);
}else if (status == SBJsonStreamParserWaitingForData) {
NSLog(@"Parser waiting for more data");
}
}];
[request setFailedBlock:^{
NSError *error = [request error];
NSLog(@"failed - %@ %@", [error localizedDescription], error);
}];
[request startAsynchronous];
}
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GitHub:https://github.com/johnezang/JSONKit
提供比SBJson更优异的性能以及更加简便的使用方法,但是中文最好使用utf-8格式(\uXXXX),否则容易造成乱码。
API调用起来非常简单,省去了SBJson那么一大堆的方法:
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JSONDecoder* decoder = [[JSONDecoder alloc] initWithParseOptions:JKParseOptionNone];
id result = [decoder objectWithData:jsonData];
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详细的使用方法请看它的GitHub主页。
SDWebImage用于异步下载网络上的图片,并支持对图片的缓存等。
多数情况下是使用UIImageView+WebCache为UIImageView异步加载图片:
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#import <SDWebImage/UIImageView+WebCache.h>
// ...
[cell.imageView setImageWithURL:[NSURL URLWithString:@"
http://www.domain.com/path/to/image.jpg
"]
placeholderImage:[UIImage imageNamed:@"placeholder.png"]];
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需要注意的是,pladeholderImage的大小一定要大于UIImageView的大小,否则可能不显示placeholderImage图片。
它还支持block语法用于在加载完成时做一些操作:
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[cell.imageView setImageWithURL:[NSURL URLWithString:@"
http://www.domain.com/path/to/image.jpg
"]
placeholderImage:[UIImage imageNamed:@"placeholder.png"]
completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType) {... completion code here ...}];
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SDWebImage并不局限于UIImageView上,使用SDWebImageManager完成更多的操作:
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SDWebImageManager *manager = [SDWebImageManager sharedManager];
[manager downloadWithURL:imageURL
options:0
progress:^(NSUInteger receivedSize,long long expectedSize)
{
// 下载进度
}
completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType)
{
if (image)
{
// 下载完成
}
}];
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或者使用Image Downloader也是一样的效果:
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[SDWebImageDownloader.sharedDownloader downloadImageWithURL:imageURL
options:0
progress:^(NSUInteger receivedSize,long long expectedSize)
{
// 进度
}
completed:^(UIImage *image, NSData *data, NSError *error,BOOL finished)
{
if (image && finished)
{
// 下载完成
}
}];
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GitHub:https://github.com/JJSaccolo/UIActivityIndicator-for-SDWebImage
用于为SDWebImage在UIImageView加载图片时,显示加载效果(UIActivityIndicatorView实现),它提供以下方法:
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- (void)setImageWithURL:(NSURL *)url usingActivityIndicatorStyle:(UIActivityIndicatorViewStyle)activityStyle;
- (void)setImageWithURL:(NSURL *)url placeholderImage:(UIImage *)placeholder usingActivityIndicatorStyle:(UIActivityIndicatorViewStyle)activityStyle;
- (void)setImageWithURL:(NSURL *)url placeholderImage:(UIImage *)placeholder options:(SDWebImageOptions)options usingActivityIndicatorStyle:(UIActivityIndicatorViewStyle)activityStyle;
- (void)setImageWithURL:(NSURL *)url completed:(SDWebImageCompletedBlock)completedBlock usingActivityIndicatorStyle:(UIActivityIndicatorViewStyle)activityStyle;
- (void)setImageWithURL:(NSURL *)url placeholderImage:(UIImage *)placeholder completed:(SDWebImageCompletedBlock)completedBlock usingActivityIndicatorStyle:(UIActivityIndicatorViewStyle)activityStyle;
- (void)setImageWithURL:(NSURL *)url placeholderImage:(UIImage *)placeholder options:(SDWebImageOptions)options completed:(SDWebImageCompletedBlock)completedBlock usingActivityIndicatorStyle:(UIActivityIndicatorViewStyle)activityStyle;
- (void)setImageWithURL:(NSURL *)url placeholderImage:(UIImage *)placeholder options:(SDWebImageOptions)options progress:(SDWebImageDownloaderProgressBlock)progressBlock completed:(SDWebImageCompletedBlock)completedBlock usingActivityIndicatorStyle:(UIActivityIndicatorViewStyle)activityStyle;
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GitHub:https://github.com/coryalder/UIImage_Resize
提供多种方法为图片设置透明度、圆角、裁剪、调整大小等:
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- (UIImage *)imageWithAlpha;
- (UIImage *)transparentBorderImage:(NSUInteger)borderSize;
- (UIImage *)roundedCornerImage:(NSInteger)cornerSize borderSize:(NSInteger)borderSize;
- (UIImage *)croppedImage:(CGRect)bounds;
- (UIImage *)thumbnailImage:(NSInteger)thumbnailSize
transparentBorder:(NSUInteger)borderSize
cornerRadius:(NSUInteger)cornerRadius
interpolationQuality:(CGInterpolationQuality)quality;
- (UIImage *)resizedImage:(CGSize)newSize
interpolationQuality:(CGInterpolationQuality)quality;
- (UIImage *)
resizedImageWithContentMode:(UIViewContentMode)contentMode
bounds:(CGSize)bounds
interpolationQuality:(CGInterpolationQuality)quality;
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更详细使用见:http://vocaro.com/trevor/blog/2009/10/12/resize-a-uiimage-the-right-way/
GitHub:https://github.com/toptierlabs/ImageCacheResize
整合了SDWebImage和UIImage+Resize的功能,用于图片的异步加载、缓存、以及下载完成后调整大小并显示在UIImageView上。
提供了以下API用于加载图片以及加载完成后调整图片大小:
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- (void)setImageWithURL:(NSURL *)url andCropToBounds:(CGRect)bounds;
- (void)setImageWithURL:(NSURL *)url andResize:(CGSize)size withContentMode:(UIViewContentMode)mode;
- (void)setImageWithURL:(NSURL *)url placeholderImage:(UIImage *)placeholder andCropToBounds:(CGRect)bounds;
- (void)setImageWithURL:(NSURL *)url placeholderImage:(UIImage *)placeholder options:(SDWebImageOptions)options andResize:(CGSize)size;
- (void)setImageWithURL:(NSURL *)url placeholderImage:(UIImage *)placeholder options:(SDWebImageOptions)options andResize:(CGSize)size withContentMode:(UIViewContentMode)mode;
- (void)setImageWithURL:(NSURL *)url placeholderImage:(UIImage *)placeholder options:(SDWebImageOptions)options andCropToBounds:(CGRect)bounds;
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使用方法和SDWebImage一样简单,如以下官方例子:
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[imageview setImageWithURL:[NSURL URLWithString:@"
http://t0.gstatic.com/images?q=tbn:ANd9GcQfraHpiabjEY8iDdBe9OUQYHMtwfuAv9ZRR0RYKuoVF_EpE8Fp5A
"] andResize:CGSizeMake(30, 30) withContentMode:UIViewContentModeScaleAspectFit]; // 按比例缩放
[imageview setImageWithURL:[NSURL URLWithString:@"
http://t0.gstatic.com/images?q=tbn:ANd9GcQfraHpiabjEY8iDdBe9OUQYHMtwfuAv9ZRR0RYKuoVF_EpE8Fp5A
"] andCropToBounds:CGRectMake(0, 0, 100, 100)]; // 裁剪成100x100大小
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GitHub:https://github.com/enormego/EGOTableViewPullRefresh
这是最早出现的为UITableView提供下拉刷新功能的类库,使用起来稍显麻烦,需要实现诸多协议(代码取自官方DEMO):
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#import "EGORefreshTableHeaderView.h"
@interface RootViewController : UITableViewController <EGORefreshTableHeaderDelegate, UITableViewDelegate, UITableViewDataSource>{
EGORefreshTableHeaderView *_refreshHeaderView;
// 是否正在加载中
BOOL _reloading;
}
- (void)viewDidLoad {
[super viewDidLoad];
if (_refreshHeaderView == nil) {
EGORefreshTableHeaderView *view = [[EGORefreshTableHeaderView alloc] initWithFrame:CGRectMake(0.0f, 0.0f - self.tableView.bounds.size.height, self.view.frame.size.width, self.tableView.bounds.size.height)];
view.delegate = self;
[self.tableView addSubview:view];
_refreshHeaderView = view;
[view release];
}
// 更新最后加载时间
[_refreshHeaderView refreshLastUpdatedDate];
}
#pragma mark -
#pragma mark Data Source Loading / Reloading Methods
- (void)reloadTableViewDataSource{
// 在这里加入代码用于获取数据
_reloading = YES;
}
- (void)doneLoadingTableViewData{
// 数据加载完成时调用这个方法
_reloading = NO;
[_refreshHeaderView egoRefreshScrollViewDataSourceDidFinishedLoading:self.tableView];
}
#pragma mark -
#pragma mark UIScrollViewDelegate Methods
- (void)scrollViewDidScroll:(UIScrollView *)scrollView{
[_refreshHeaderView egoRefreshScrollViewDidScroll:scrollView];
}
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{
[_refreshHeaderView egoRefreshScrollViewDidEndDragging:scrollView];
}
#pragma mark -
#pragma mark EGORefreshTableHeaderDelegate Methods
- (void)egoRefreshTableHeaderDidTriggerRefresh:(EGORefreshTableHeaderView*)view{
[self reloadTableViewDataSource];
[self performSelector:@selector(doneLoadingTableViewData) withObject:nil afterDelay:3.0];
}
- (BOOL)egoRefreshTableHeaderDataSourceIsLoading:(EGORefreshTableHeaderView*)view{
return _reloading;// should return if data source model is reloading
}
- (NSDate*)egoRefreshTableHeaderDataSourceLastUpdated:(EGORefreshTableHeaderView*)view{
return [NSDate date];// should return date data source was last changed
}
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GitHub:https://github.com/leah/PullToRefresh
PullToRefresh提供比EGOTableViewPullRefresh更加简单的使用方法,只要继承自PullRefreshTableViewController,再实现refresh方法即可:
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- (void)refresh {
// 加载数据
[self.tableView reloadData];// 重新载入UITableView
[self stopLoading];//停止动画
}
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GitHub:https://github.com/shiki/STableViewController
STableViewController比PullToRefresh多了一个上拉加载更多功能,使用上也差不多简单,需要继承自STableViewController,再实现一些方法:
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- (void) viewDidLoad
{
[super viewDidLoad];
self.title = @"STableViewController Demo";
[self.tableView setBackgroundColor:[UIColor lightGrayColor]];
// 需要创建两个自定义视图用于显示"下拉刷新"、"上拉加载更多"
self.headerView = headerView;
self.footerView = footerView;
}
#pragma mark - Pull to Refresh
- (void) pinHeaderView
{
[super pinHeaderView];
// 下拉刷新视图显示一些加载动画
}
- (void) unpinHeaderView
{
[super unpinHeaderView];
// 下拉刷新视图停止动画
}
- (void) headerViewDidScroll:(BOOL)willRefreshOnRelease scrollView:(UIScrollView *)scrollView
{
// 下拉刷新视图显示状态信息
if (willRefreshOnRelease)
//hv.title.text = @"松开后刷新...";
else
//hv.title.text = @"下拉刷新...";
}
- (BOOL) refresh
{
if (![super refresh])
return NO;
// 下拉刷新加载数据
[self performSelector:@selector(addItemsOnTop) withObject:nil afterDelay:2.0];
return YES;
}
#pragma mark - Load More
- (void) willBeginLoadingMore
{
// 上拉加载更多视图加载动画
}
- (void) loadMoreCompleted
{
[super loadMoreCompleted];
// 上拉加载更多视图停止动画
if (!self.canLoadMore) {
//没有更多数据的时候执行代码...
}
}
- (BOOL) loadMore
{
if (![super loadMore])
return NO;
// 上拉加载更多数据
[self performSelector:@selector(addItemsOnBottom) withObject:nil afterDelay:2.0];
return YES;
}
//
- (void) addItemsOnTop
{
// 加载数据...
[self.tableView reloadData];
// 数据加载完成通知上拉视图
[self refreshCompleted];
}
- (void) addItemsOnBottom
{
// 加载更多数据...
[self.tableView reloadData];
// 通过判断设置是否可以加载更多
//self.canLoadMore = NO;
// 数据加载完成通知下拉视图
[self loadMoreCompleted];
}
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GitHub:https://github.com/samvermette/SVPullToRefresh
包含SVPullToRefresh + SVInfiniteScrolling为UITableView提供下拉刷新、上拉加载更多功能。
使用起来也相当简单,只要在UITableViewController里实现以下方法:
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- (void)viewDidLoad {
[super viewDidLoad];
__weak SVViewController *weakSelf = self;
// 设置下拉刷新
[self.tableView addPullToRefreshWithActionHandler:^{
[weakSelf insertRowAtTop];
}];
// 设置上拉加载更多
[self.tableView addInfiniteScrollingWithActionHandler:^{
[weakSelf insertRowAtBottom];
}];
}
- (void)viewDidAppear:(BOOL)animated {
[tableView triggerPullToRefresh];
}
- (void)insertRowAtTop {
// 获取数据....
// 停止动画
[self.tableView.pullToRefreshView stopAnimating];
}
- (void)insertRowAtBottom {
// 获取数据....
// 停止动画
[weakSelf.tableView.infiniteScrollingView stopAnimating];
}
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GitHub:https://github.com/chrismiles/CMPopTipView
CMPopTipView用于在一些视图上显示提示信息:
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self.tipView = [[CMPopTipView alloc] initWithMessage:@"提示消息"];
self.tipView.delegate = self;
[self.tipView presentPointingAtView:anyButton inView:self.view animated:YES];// 点击按钮显示
[self.tipView presentPointingAtBarButtonItem:barButtonItem animated:YES];// 点击导航栏按钮显示
#pragma mark CMPopTipViewDelegate methods
- (void)popTipViewWasDismissedByUser:(CMPopTipView *)popTipView {
// 清理资源
self.tipView = nil;
}
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GitHub:https://github.com/vicpenap/PrettyKit
定制了一些UI组件如UITableViewCell、UINavigationBar、UITabBar、UIToolBar等,比系统自带的更加美观。
GitHub:https://github.com/sobri909/MGBox2
提供一些定制的UI组件可以更简单快速的创建表格、网格布局,以及丰富的文本呈现,基于block的事件机制等,包含:MGBox、MGTableBox、MGTableBoxStyled、MGScrollView、MGButton、MGEvents、MGEasyFrame、MGLine等,其中MGBox还支持screenshot方法用于截图。
GitHub:https://github.com/jverkoey/nimbus
著名的框架,提供了一套非常丰富的UI组件,可以使开发变得更加简单、有效率。
GitHub:https://github.com/Grouper/FlatUIKit
扁平化设计的UI组件,类似于WP或者iOS7的风格。
GitHub:https://github.com/muccy/MUKMediaGallery
媒体库效果,支持图片、视频及音频。
GitHub:https://github.com/exalted/PTShowcaseViewController
同样是一个媒体库效果,支持的格式更多,包括:图片、视频、PDF等.
GitHub:https://github.com/mwaterfall/MWPhotoBrowser
图片展示效果,支持本地及远程的图片,使用也比较简单,只要实现MWPhotoBrowserDelegate协议:
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@interface TestViewController ()<MWPhotoBrowserDelegate>
{
NSArray *_photos;
}
-(void) doAction {
NSMutableArray *photos = [[NSMutableArray alloc] init];
for (...) {
MWPhoto* photo = [MWPhoto photoWithURL:[NSURL URLWithString:url]];// 设置图片地址
photo.caption = description;// 设置描述
[photos addObject:photo];
}
_photos = photos;
MWPhotoBrowser *browser = [[MWPhotoBrowser alloc] initWithDelegate:self];
browser.displayActionButton = YES;
UINavigationController *nc = [[UINavigationController alloc] initWithRootViewController:browser];
nc.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
[self presentModalViewController:nc animated:YES];
}
#pragma mark - MWPhotoBrowserDelegate
- (NSUInteger)numberOfPhotosInPhotoBrowser:(MWPhotoBrowser *)photoBrowser {
return _photos.count;
}
- (MWPhoto *)photoBrowser:(MWPhotoBrowser *)photoBrowser photoAtIndex:(NSUInteger)index {
if (index < _photos.count)
return [_photos objectAtIndex:index];
return nil;
}
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GitHub:https://github.com/esilverberg/ios-image-filters
提供多种图片滤镜效果。
GitHub:https://github.com/vfr/Reader
PDF阅读器核心。
GitHub:https://github.com/Cocoanetics/DTCoreText
支持富文本的显示如HTML。
GitHub:https://github.com/FuerteInternational/FTCoreText
富文本视图
GitHub:https://github.com/akosma/CoreTextWrapper
支持多列的文本视图
GitHub:https://github.com/nicklockwood/Base64
提供对字符串的Base64编码
GitHub:https://github.com/rnapier/RNCryptor
提供AES加密方法