1 + (BOOL)isBlankString:(NSString *)string
2 {
3 if (string == nil)
4 {
5 returnYES;
6 }
7 if (string == NULL)
8 {
9 returnYES;
10 }
11 if ([string isKindOfClass:[NSNullclass]])
12 {
13 returnYES;
14 }
15 if ([[string stringByTrimmingCharactersInSet:[NSCharacterSetwhitespaceAndNewlineCharacterSet]] length]==0)
16 {
17 returnYES;
18 }
19 returnNO;
20 }
21
22
23
24 +(Boolean) isEmptyOrNull:(NSString *) str
25 {
26
27 if (!str)
28 {
29
30 // null object
31
32 return YES;
33
34 }
35 else
36 {
37
38 NSString *trimedString = [str stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
39
40 if ([trimedString length] == 0)
41 {
42
43 // empty string
44
45 return YES;
46
47 }
48 else
49 {
50
51 // is neither empty nor null
52
53 return NO;
54
55 }
56
57 }
58 }
