转载自CSDN

二 iOS常见分类

一些必要的类别iOS开发。包括的NSDate，的NSString，NSUserDefaults的，和的UIColor帮助UIImage的方法。

1. NSDate

-(NSString *)formatWithString:(NSString *)format;
-(NSString *)formatWithStyle:(NSDateFormatterStyle)style;
-(NSString *)distanceOfTimeInWords;
-(NSString *)distanceOfTimeInWords:(NSDate *)date;

2. NSString

-(NSString *)MD5;
-(NSString *)sha1;
-(NSString *)reverse;
-(NSString *)URLEncode;
-(NSString *)URLDecode;
-(NSString *)stringByStrippingWhitespace;
-(NSString *)substringFrom:(NSInteger)from to:(NSInteger)to;
-(NSString *)CapitalizeFirst:(NSString *)source;
-(NSString *)UnderscoresToCamelCase:(NSString*)underscores;
-(NSString *)CamelCaseToUnderscores:(NSString *)input;
-(NSUInteger)countWords;
-(BOOL)contains:(NSString *)string;
-(BOOL)isBlank;

3. NSUserDefaults

+(void)saveObject:(id)object forKey:(NSString *)key;
+(id)retrieveObjectForKey:(NSString *)key;
+(void)deleteObjectForKey:(NSString *)key;

4. UIColor

+(UIColor *)colorWithHex:(int)hex;

5. UIImage + GIF

+(UIImage *)animatedImageWithAnimatedGIFData:(NSData *)theData;
+(UIImage *)animatedImageWithAnimatedGIFURL:(NSURL *)theURL;

下载地址:http://download.csdn.net/detail/baihuaxiu123/9509303

三 辅助软件

1：XCODE文档注解插件VVDocumenter
地址：https://github.com/onevcat/VVDocumenter-Xcode

2：将JSON格式化输出为模型的属性
地址：https://github.com/EnjoySR/ESJsonFormat-Xcode

3：图片提示插件
地址：https://github.com/ksuther/KSImageNamed-Xcode

4：图片转换插件
地址：https://github.com/rickytan/RTImageAssets