摘要：iPhone开发之深入浅出 (1) — ARC是什么博主：易飞扬原文链接:http://www.yifeiyang.net/development-of-the-iphone-simply-1/iPhone开发之深入浅出 (2) — ARC之@property使用博主：易飞扬原文链接:http://www.yifeiyang.net/development-of-the-iphone-simply-2/iPhone开发之深入浅出 (3) — ARC之前世今生博主：易飞扬原文链接:http://www.yifeiyang.net/development-of-the-iphone-simply- 阅读全文

摘要：xcode 4.2非常可恶，原来的代码里有调用performselector:withObject:的地方无一例外获得一个警告：Semantic IssuePerformSelector may cause a leak because its selector is unknownwarning倒是不影响程序运行，但是这人要是有点代码小洁癖的话，那日子就没法过了，这warning怎么看都碍眼。所以必须得想办法把它弄没了：#pragma clang diagnostic push#pragma clang diagnostic ignored "-Warc-performSelect 阅读全文

摘要：http://raptureinvenice.com/arc-support-without-branches/ 阅读全文

摘要：去这里http://developer.apple.com/iphone/library/samplecode/Reachability/Introduction/Intro.html#//apple_ref/doc/uid/DTS40007324-Intro-DontLinkElementID_2下载Reachability.m和Reachability.h，然后添加到你的项目里面，在需要测试网络连接class里面写这样的一个方法- (BOOL)testConnection {BOOL result = YES;Reachability *reach=[Reachability shared 阅读全文

摘要：1.导入MessageUI.framework框架2.在需要应用的控制器头文件：#import <MessageUI/MessageUI.h>，并加入委托：<MFMailComposeViewControllerDelegate>3.实现方法：-(void)displayComposerSheet{ MFMailComposeViewController *picker = [[MFMailComposeViewController alloc] init]; picker.mailComposeDelegate = self; [picker setSubject:@ 阅读全文

摘要：-(void)leftClick{[UIViewbeginAnimations:nilcontext:nil];//displaymode,slowatbeginningandend[UIViewsetAnimationCurve:UIViewAnimationCurveEaseInOut];//动画时间[UIViewsetAnimationDuration:1.0f];//使用当前正在运行的状态开始下一段动画[UIViewsetAnimationBeginsFromCurrentState:YES];//给视图添加过渡效果[UIViewsetAnimationTransition:UIVie 阅读全文

摘要：nil: Anullpointer to an Objective-C object.
( #definenil((id)0) )
Nil: Anullpointer to an Objective-C class.
NULL: Anullpointer to anything else. ( #defineNULL((void *)0) )
NSNull: A class defines a singleton object used to representnullvalues in collection objects (which don't allownilvalues).
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