一，代码。
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
NSString *string=@"123 456 789 ";
NSLog(@"--string---%@",string);
NSString *newStr= [string stringByReplacingOccurrencesOfString:@" " withString:@""];
NSLog(@"--newStr--%@",newStr);
}
二，输出。
2015-10-23 10:49:19.629 去掉NSString中的空格[3699:88351] --string---123 456 789
2015-10-23 10:49:19.629 去掉NSString中的空格[3699:88351] --newStr--123456789
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