NSString的实用技巧

//判断是否包含前后缀

NSString *string = @"I love China";

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

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

//替换字符串

NSString *string = @"I love China";

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

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

//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);