nsstring

Convert NSString to NSDate [duplicate]

由 倾然丶 夕夏残阳落幕 提交于 2020-01-11 03:24:06
问题 This question already has answers here : Closed 6 years ago . Possible Duplicate: Converting NSString to NSDate (and back again) I make a request to the flickr api and it returns me the date in the following format "2013-02-01T06:25:47Z" How do i convert this into NSDate format?? 回答1: It's a simple one, converting NSString to NSDate we use NSDateformatter using dateFromString method. We need to provide the Dateformatter style with existing style for NSString NSDateFormatter *dateFormatter = [

Iphone开发代码片段3

由 元气小坏坏 提交于 2020-01-11 01:00:23
Iphone代码片段导航 Iphone开发代码片段1 Iphone开发代码片段2 Iphone开发代码片段3 1.给UITableViewController添加ToolBar。 self.navigationController.toolbarHidden = NO; //默认是隐藏的。 //添加MessageToolBar ，messageToolBar是IBOutlet的一个ToolBar。 self.toolbarItems = [[[NSMutableArray alloc] initWithArray:self.messageToolBar.items] autorelease]; self.navigationController.toolbar.barStyle = self.messageToolBar.barStyle; 2.后台运行一个方法，如果该方法需要修改UI，为了防止出错，应在主线程里修改UI。 [self performSelectorInBackground:@selector(updateInfo)]; 在UpdateInfo里如果要修改UI ， [self performSelectorOnMainThread:@selector(updateUIMethod) withObject:nil waitUntilDone:NO]; 同时注意

How can i implement the behaviour as in cluster pattern by apple (NSString and NSCFString)

由 不想你离开。 提交于 2020-01-10 20:16:12
问题 I am simply writing the following code for testing purpose: NSString *aStr = [[NSString alloc] initWithFormat:@"Foo"]; aStr = [aStr initWithFormat:@"Bar"];//Crashed here I am getting the following error: *** initialization method -initWithFormat:locale:arguments: cannot be sent to an abstract object of class __NSCFString: Create a concrete instance! If i write the following code same thing happen NSString *aStr = [NSString alloc]; aStr = [aStr initWithFormat:@"Foo"]; aStr = [aStr

iOS开发中一些有用的小代码

由 不打扰是莪最后的温柔 提交于 2020-01-10 11:00:42
1. 判断邮箱格式是否正确的代码： // 利用正则表达式验证 -(BOOL)isValidateEmail:(NSString *)email { NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}"; NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES%@",emailRegex]; return [emailTest evaluateWithObject:email]; } 2.图片压缩 用法： UIImage *yourImage= [self imageWithImageSimple:image scaledToSize:CGSizeMake(210.0, 210.0)]; // 压缩图片 - (UIImage*)imageWithImageSimple:(UIImage*)image scaledToSize:(CGSize)newSize { // Create a graphics image context UIGraphicsBeginImageContext(newSize); // Tell the old image to draw in this newcontext,

If statement checking for NSString equality using ==

由 天大地大妈咪最大 提交于 2020-01-09 11:58:06
问题 I am making a server call in some Objective-c code. If it returns as a @"yes" , it will do an action. For some reason, the // DO ACTION HERE part is never reached. NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil]; NSString *returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding]; NSString *returnStringResults = returnString; NSString *yesText = @"yes"; if (returnStringResults == yesText) { testLabel.text = @

Return a word-wrapped NSString from a longer NSString [duplicate]

由 南笙酒味 提交于 2020-01-09 10:22:29
问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: UITextView : get text with wrap info I have been scouting the NSString library and numerous libraries for a function that can take a long string like this : Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris

iOS开发之字符串去掉首尾空格换行

由 五迷三道 提交于 2020-01-08 12:41:43
（1）去掉字符串首尾空格的方法： NSString *str = [str stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]]； （2）去掉字符串首尾换行的方法： NSString *str = [str stringByTrimmingCharactersInSet:[NSCharacterSet newlineCharacterSet]]; （3）去掉字符串首尾空格和换行的方法： NSString *str = [str stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]]; （4）替换字符串内所有空格的方法： NSString *str = [str stringByReplacingOccurrencesOfString:@" " withString:@""]; （5）替换字符串内所有空格的方法： NSString *str = [str stringByReplacingOccurrencesOfString:@"\n" withString:@""]; 来源： https://www.cnblogs.com/hecanlin/p/12165846.html

[iOS]MD5加密字符串

由 六眼飞鱼酱① 提交于 2020-01-07 21:08:03
本文转载自： http://www.cnblogs.com/bobli/archive/2012/06/26/2563295.html 作者：bobli 转载请注明该声明。 将 字符 串进行MD5加密，返回加密后的字符串。 #import <CommonCrypto/CommonDigest.h> // Need to import for CC_MD5 access - (NSString *)md5:(NSString *)str { const char *cStr = [str UTF8String]; unsigned char result[ 16 ]; CC_MD5(cStr, strlen(cStr), result); // This is the md5 call return [NSString stringWithFormat: @" %02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x " , result[ 0 ], result[ 1 ], result[ 2 ], result[ 3 ], result[ 4 ], result[ 5 ], result[ 6 ], result[ 7 ], result[ 8 ], result[ 9 ], result[ 10 ],

Object-c @Property

由 和自甴很熟 提交于 2020-01-07 16:27:58
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> http://blog.csdn.net/dqjyong/article/details/7668601(原博客) 以下是对原博客的整理 导航： 读写属性：（readwrite/readonly）以及（getter=name）、（setter=name） setter语意：（assign/retain/copy） 原子性： （non）atomic 从OC 2.0开始，我们能让系统自动生成设置变量值的方法或获取变量值的方法，即系统会自动为我们生成setter/getter方法。 @property（attribution）Vartype Varname； Setter and Getter 提醒一下，采用@property与自定义setter和getter方式其实是等价的，但是编译器会优先查找自动的setter/getter方法，如果找不到，就会使用@property对应的属性。 @propert（nonatomic ,copy）NSString *name; 这条语句等价于： 完成setter方法为： -(void)setName:(NSString*)newName{ if(newName!=name){ [name release]; name=[newName copy]; } } 完成getter方法为

#define vs const and linking against frameworks

由 こ雲淡風輕ζ 提交于 2020-01-07 06:15:27
问题 I have a really small lightweight application which needs to use some constants that are stored in a larger framework. I don't want to duplicate these constants and hardcode them into the lightweight application but I also don't want to have to link against the large framework to just get the constants. The constants are defined using static NSString *const in a header file. Does replacing the static NSString *const with #define prevent me from having to link against the whole framework ? To
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