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#pragma mark 清空字符串中的空白字符- (NSString
*)trimString{ return
[self stringByTrimmingCharactersInSet:[NSCharacterSet
whitespaceAndNewlineCharacterSet]];}#pragma mark 是否空字符串- (BOOL)isEmptyString{ return
(self == nil || self.length == 0);}#pragma mark 返回沙盒中的文件路径- (NSString
*)documentsPath{ NSString
*path = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0]; return
[path stringByAppendingString:self];}#pragma mark 写入系统偏好- (void)saveToNSDefaultsWithKey:(NSString
*)key{ [[NSUserDefaults
standardUserDefaults] setObject:self
forKey:key]; [[NSUserDefaults
standardUserDefaults] synchronize];} |
原文：http://www.cnblogs.com/myios/p/3569187.html