我读过this和that.我正是想要这个:1.4324=>"1.43"9.4000=>"9.4"43.000=>"43"9.4=>"9.40"(wrong)43.000=>"43.00"(wrong)这两个问题的答案都指向NSNumberFormatter。所以它应该很容易实现，但对我来说不是。-(void)viewDidLoad{[superviewDidLoad];UILabel*myLabel=[[UILabelalloc]initWithFrame:CGRectMake(50,100,200,20)];NSNumberFormatter*doubleValueWithMaxTw

我读过this和that.我正是想要这个:1.4324=>"1.43"9.4000=>"9.4"43.000=>"43"9.4=>"9.40"(wrong)43.000=>"43.00"(wrong)这两个问题的答案都指向NSNumberFormatter。所以它应该很容易实现，但对我来说不是。-(void)viewDidLoad{[superviewDidLoad];UILabel*myLabel=[[UILabelalloc]initWithFrame:CGRectMake(50,100,200,20)];NSNumberFormatter*doubleValueWithMaxTw