ios 不區分字符串大小寫的比較

編輯：關於IOS

NSString *str;
// 使用stringWithFormat生成一格式化字符串
str = [NSString stringWithFormat:@"This is %@","John"];
NSLog(@"str--->%@",str);
// 字符串長度length;
NSLog(@"The length of this string is %@",[str length]);
// 字符串比較 isEqualToString, 返回NO(false)，isEqualToString區分大小寫
BOOL isequal = [str isEqualToString:@"this is John"];
// 字符串序列比列 compare,返回結果NSComparisonResult
// type enum _NSComparisonResult{
// NSOrderedAscending = -1,
// NSOrderedSame,
// NSOrderedDescending
// }
int result = [@"bool" compare:@"cool"];
NSLog(@"The result is %d",result);
// compare 比較規則options
// NSLiteralSearch 區分大小寫(完全比較)
// NSCaseInsensitiveSearch 不區分大小寫
// NSNumericSearch 只比較字符串的個數，而不比較字符串的字面值
int result1 = [@"This is John" compare:@"this is John" options:NSCaseInsensitiveSearch | NSNumericSearch];
NSLog(@"The result is %d",result1);
// 字符串開頭是否包括另一字符串 hasPrefix,返回結果YES(true)
BOOL isHas = [str hasPrefix:@"This"];
// 字符串結尾是否包括另一字符串 hasSuffix,返回結果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);