UIButton在不同狀態(被點擊\正常狀態\不可用\ ...)標題是可以不同的

按鈕的狀態

typedef NS_OPTIONS(NSUInteger, UIControlState) {
    UIControlStateNormal       = 0,
    UIControlStateHighlighted  = 1 << 0,                  // used when UIControl isHighlighted is set
    UIControlStateDisabled     = 1 << 1,
    UIControlStateSelected     = 1 << 2,                  // flag usable by app (see below)
    UIControlStateFocused NS_ENUM_AVAILABLE_IOS(9_0) = 1 << 3, // Applicable only when the screen supports focus
    UIControlStateApplication  = 0x00FF0000,              // additional flags available for application use
    UIControlStateReserved     = 0xFF000000               // flags reserved for internal framework use
};

以下代碼獲取正常狀態下的標題,並賦值給別的變量

UIControlStateNormal為正常狀態

- (IBAction)buttonPressed:(UIButton *)sender {
    NSString *title = [sender titleForState:UIControlStateNormal];
    NSString *plainText = [NSString stringWithFormat:@"%@ button pressed.", title];
    _statusLable.text = plainText;
}

怎麽獲取UIButton標題?