- (void)test{
NSString *testString = @"Hello World";
// lower case
NSString *lowerCaseString1 = [testString lowercaseString];
NSString *lowerCaseString2 = testString.lowercaseString;
// upper case
NSString *upperCaseString1 = [lowerCaseString1 uppercaseString];
NSString *upperCaseString2 = lowerCaseString1.uppercaseString;
NSLog(@"lowerCaseString1: %@",lowerCaseString1);
NSLog(@"lowerCaseString2: %@",lowerCaseString2);
NSLog(@"upperCaseString1: %@",upperCaseString1);
NSLog(@"upperCaseString2: %@",upperCaseString2);
// capitalize the first word of the sentence
NSString *txt = @"hi my friends!";
txt = [txt stringByReplacingCharactersInRange:NSMakeRange(0,1) withString:[[txt substringToIndex:1] uppercaseString]];
NSLog(@"txt: %@", txt);
}
打印结果：
2014-08-26 17:00:30.266 MyApp[68821:60b] lowerCaseString1: hello world
2014-08-26 17:00:30.267 MyApp[68821:60b] lowerCaseString2: hello world
2014-08-26 17:00:30.267 MyApp[68821:60b] upperCaseString1: HELLO WORLD
2014-08-26 17:00:30.267 MyApp[68821:60b] upperCaseString2: HELLO WORLD
2014-08-26 17:00:30.268 MyApp[68821:60b] txt: Hi my friends!
