0.首字母大寫(xiě)
代碼：
//首字母大寫(xiě)
NSString *string = @"ligang";
NSLog(@"string: %@",[string capitalizedString]);
1.分割字符串
代碼：
//分割字符串
NSString *string = @"This is a iOSDevTip";
NSArray *array = [string componentsSeparatedByString:@"a"];
NSString *string1 = [array objectAtIndex:0];
NSString *string2 = [array objectAtIndex:1];
NSLog(@"string1:%@ string2:%@",string1,string2);
2.追加字符串
代碼：
//追加字符串
NSMutableString *string = [[NSMutableString alloc] initWithString:@"I Love "];
[string appendString:@"China"];
NSLog(@"string:%@",string);
3.插入字符串
代碼：
//插入字符串
NSMutableString *string = [[NSMutableString alloc] initWithString:@"I China"];
[string insertString:@"Love " atIndex:2];
NSLog(@"string: %@",string);
4.刪除字符串
代碼：
//刪除字符串
NSMutableString *string = [[NSMutableString alloc] initWithString:@"I love China"];
[string deleteCharactersInRange:NSMakeRange(2, 4)];
NSLog(@"String1: %@",string);
打印：
2015-07-16 22:46:58.437 iOSStrongDemo[10219:3057749] String1: I China
5.判斷是否包含前后綴
代碼：
//判斷是否包含前后綴
NSString *string = @"I love China";
BOOL isHasI = [string hasPrefix:@"I"];
BOOL isHasChina = [string hasSuffix:@"China"];
6.替換字符串
代碼：
//替換字符串
NSString *string = @"I love China";
NSString *replaceString = [string stringByReplacingOccurrencesOfString:@"love" withString:@"like"];
NSLog(@"replaceString: %@",replaceString);
打优菀弧：
2015-07-16 22:56:07.405 iOSStrongDemo[10236:3059503] replaceString: I like China
7.去除字符串首尾的空格和換行符
代碼：
//去除字符串首尾的空格和換行符
NSString *string = @" I love China ";
NSString *text = [string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
NSLog(@"text:%@",text);
