NSString的比较专栏
先做个笔记不做具体说明,有空了再补上
NSString *str; // 使用stringWithFormat生成一格式化字符串 str = [NSString stringWithFormat:@"This is %@","John"]; NSLog(@"str--->%@",str); // 字符串长度length; NSLog(@"The length of this string is %@",[str length]); // 字符串比较 isEqualToString, 返回NO(false),isEqualToString区分大小写 BOOL isequal = [str isEqualToString:@"this is John"]; // 字符串序列比列 compare,返回结果NSComparisonResult // type enum _NSComparisonResult{ // NSOrderedAscending = -1, // NSOrderedSame, // NSOrderedDescending // } int result = [@"bool" compare:@"cool"]; NSLog(@"The result is %d",result); // compare 比较规则options // NSLiteralSearch 区分大小写(完全比较) // NSCaseInsensitiveSearch 不区分大小写 // NSNumericSearch 只比较字符串的个数,而不比较字符串的字面值 int result1 = [@"This is John" compare:@"this is John" options:NSCaseInsensitiveSearch | NSNumericSearch]; NSLog(@"The result is %d",result1); // 字符串开头是否包括另一字符串 hasPrefix,返回结果YES(true) BOOL isHas = [str hasPrefix:@"This"]; // 字符串结尾是否包括另一字符串 hasSuffix,返回结果YES(true) BOOL isHas = [str hasSuffix:@"John"]; // 查找字符串在另一字符串中的位置 NSRange range = [str rangeOfString:@"is" options:NSCaseInsensitiveSearch]; NSLog(@"The location in the string named 'str' of 'is' is @d",range.location);
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