NSString 的七种使用技巧

1.分割字符串

NSString *string = @"This is a iOSDevTip";

分割  componentSeparatedByString

NSArray *array = [string componentsSeparatedByString:@"a"];

NSString *string1 = [array objectAtIndex:0];

NSString *string2 = [array objectAtIndex:1];

NSLog(@"string1:%@  string2:%@",string1,string2);

打印 string1:This is   string2: iOSDevTip  

2.追加字符串

NSMutableString *string = [[NSMutableString alloc] initWithString:@"I Love "];

添加appendString

[string appendString:@"China"];

NSLog(@"string:%@",string);

打印    string:I Love China

3.插入字符串

NSMutableString *string = [[NSMutableString alloc] initWithString:@"I China"];

插入 insertString

[string insertString:@"Love " atIndex:2];

NSLog(@"string: %@",string);

打印 string: I Love China

4.删除字符串

NSMutableString *string = [[NSMutableString alloc] initWithString:@"I love China"] ;

删除   deleteCharactersinRange

[string deleteCharactersInRange:NSMakeRange(2, 4)];

NSLog(@"String1: %@",string);

打印     String1: I  China

5.判断是否包含前后缀

NSString *string = @"I love China";

BOOL isHasI = [string hasPrefix:@"I"];

BOOL isHasChina = [string hasSuffix:@"China"];

6.替换字符串

NSString *string = @"I love China";

NSString *replaceString = [string stringByReplacingOccurrencesOfString:@"love" withString:@"like"];

NSLog(@"replaceString:  %@",replaceString);

打印  replaceString:  I like China

7.去除字符串首尾的空格和换行符

NSString *string = @" I love China ";

NSString *text = [string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];

NSLog(@"text:%@",text);

text:I love China