NSLog(@"大写:%@", [str uppercaseString]); NSLog(@"小写: %@", [str lowercaseString]); NSLog(@"首字母大写, 其他字母变小写", [@"aGe", capitalizedString]); BOOL result = [@"abc" isEqualToString:@"Abc"]; //返回0, 即为false //比较字符串大小. compare会返回3个值中的其中一个 //1. NSOrderedSame 右边的字符串比左边大 //2. NSOrderedAscending 两个字符串的内容相同 //3. NSOrderedDescending 左边的字符串比右边的大 NSComparisonResult result2 = [@"abc" compare:@"Abc"]; if (result2 == NSOrderedSame){ NSLog(@"两个字符串内容相同"); }else if (result2 == NSOrderedAscending){ NSLog(@"右边 > 左边"); }else if (result2 == NSOrderedDescending){ NSLog(@"右边 < 左边"); } //字符串搜索 NSString *str = @"12345.txt"; //是否以12开头 NSLog(@"是否12开头:%i", [str hasPrefix:@12]); //返回1,即true NSLog(@"是否txt结尾:%i", [str hasSuffix:@"txt"]); //返回1,即true //查找是否包含345字符串, 如果没找到,返回的location=NSNotFound //一旦找到字符串就返回,不理会后续是否还有相同的字符串 NSRange range = [str rangeOfString:@"345"]; NSLog(@"%@", NSStringFromRange(range)); if(range.location == NSNotFound){ NSLog(@"不能找到"); } NSRange range = [str rangeOfString:@"345" options: NSBackwardSearch]; //字符串的截取, 从第4位开始截取字符串 NSLog(@"%@", [str substringFromIndex: 3]); NSLog(@"%@", [str substringToIndex: 3]); //截取字符串中间范围, 截取从第3位开始,取3个字符 NSRange range = NSMakeRange(3, 3); NSLog(@"%@", [str substringWithRange: range]); //切割字符串,java中的split NSString *str = @"1,2,3,4,5,6,7"; NSArray *array = [str componentsSeparedByString:@","]; NSLog(@"%@", array); //拿到array第0个位置的字符串, array: [1,2,3,4,5,6,7] NSString *str3 = [array objectAtIndex:0]; //输出1 //文件路径拼接方法 NSMutableArray *components = [NSMutableArray array]; [components addObject: @"User"]; [components addObject: @"MJ"]; [components addObject: @"Desktop"]; NSString *path = [NSString pathWithComponents:components]; NSLog(@"%@", path); //输出User/MJ/Desktop //切割成数组 NSArray *cmps = [path pathComponents]; NSLog(@"%@", cmps); //判断是否是绝对路径 NSString path = @"users/mj/test"; NSLog(@"%i", [path isAbsolutePath]); //输出0,为false //最后一个目录输出 NSLog(@"%@", [path lastPathComponent]); //删除最后一个目录 NSLog(@"%@", [path stringByDeletingLastPathComponent]); //再最后拼接一个目录 NSLog(@"%@", [path stringByAppendingPathComponent:@"abc"]); //输出 users/mj/test/abc //拓展名处理, 获取拓展名 NSString *str = @"/user/desktop/test.text"; NSLog(@"%@", [str pathExtension]); //输出text //删除拓展名方法: stringByDeletingPathExtension //拼接拓展名方法: stringByAppendingPathExtension //强转类型 NSString *val = @"1"; int valint = [val intValue]; //计算数字,不是字符数 NString *value = @"我是字符串"; NSLog("%@", [value length]); //输出5 //取得字符串其中某个字符 NSLog("%@", [value characterAtIndex: 0]); //输出 "我" //转成C语言中的字符串 char *s = [@"abc" UTF8String];
OC中的NSString的其他用法
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转载自rayln.iteye.com/blog/1934667
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