- (void)viewDidLoad {
[super viewDidLoad];
NSArray * array = @[@"123",[NSNull null],@" 23 45 ",@" 456 "];
int count = 0;
for (NSString * str in array) {
/*
[NSNull null]作为占位符使用在容器中“字典，数组，集合”
检测参数时，先去除字符串两端的空格，再将字符串中间的空格@" "替换掉以@""就是我们要得到的字符串
*/
if (![str isEqual: [NSNull null]]) {
count ++;
NSLog(@"count = %d-%@",count,[str stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]]);
/*
2015-12-15 11:38:32.238 试炼[1328:64039] count = 1-123
2015-12-15 11:38:32.239 试炼[1328:64039] count = 2-23 45
2015-12-15 11:38:32.239 试炼[1328:64039] count = 3-456
*/
// NSLog(@"str = %@",[str stringByReplacingOccurrencesOfString:@" " withString:@""]);
/*
2015-12-15 11:37:59.011 试炼[1316:63485] str = 123
2015-12-15 11:37:59.012 试炼[1316:63485] str = 2345
2015-12-15 11:37:59.012 试炼[1316:63485] str = 456
*/
}
}
}
