我的问题是 – 我怎样才能使用Interface Builder？

UIButton *button1 = self.btnFavorite,*button2 = self.btnCalendar,*button3 = self.btnEmail,*button4 = self.btnMessage,*button5 = self.btnCall;
    NSMutableArray *constraintsForButtons = [[NSMutableArray alloc] init];
 
    float unusedHorizontalSpace = self.bounds.size.width - button1.intrinsicContentSize.width - button2.intrinsicContentSize.width - button3.intrinsicContentSize.width - button4.intrinsicContentSize.width - button5.intrinsicContentSize.width;
    NSNumber *spaceBetweenEachButton =  [NSNumber numberWithFloat: unusedHorizontalSpace / 5 ] ;
 
    [constraintsForButtons addObjectsFromArray:[NSLayoutConstraint
                                                constraintsWithVisualFormat: @"H:|-(space)-[button1]-(space)-[button2]-(space)-[button3]-(space)-[button4]-(space)-[button5]-(space)-|"
                                                options:NSLayoutFormatAlignAllCenterY
                                                metrics:@{@"space":spaceBetweenEachButton}
 
                                                views:NSDictionaryOfVariableBindings(button1,button2,button3,button4,button5)]];
 
    [constraintsForButtons addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat: @"V:|[button1]"
                                                                                        options: 0
                                                                                        metrics: nil
                                                                                          views: NSDictionaryOfVariableBindings(button1) ] ] ;
    [self addConstraints:constraintsForButtons] ;

错误：

2014-10-09 03:04:07.501 Human Response[2972:781746] Unable to simultaneously satisfy constraints.
    Probably at least one of the constraints in the following list is one you don't want. Try this: (1) look at each constraint and try to figure out which you don't expect; (2) find the code that added the unwanted constraint or constraints and fix it. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand,refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints) 
(
    "<NSLayoutConstraint:0x1568f260 H:[UIButton:0x1568f100(20)]>","<NSLayoutConstraint:0x15690b90 H:[UIButton:0x15690fc0(20)]>","<NSLayoutConstraint:0x156921c0 H:[UIButton:0x15692d00(20)]>","<NSLayoutConstraint:0x1568d4f0 H:[UIButton:0x1568d8e0(20)]>","<NSLayoutConstraint:0x1558b4c0 H:[UIButton:0x15598410(20)]>","<NSLayoutConstraint:0x155993d0 H:|-(-60)-[UIButton:0x15598410]   (Names: '|':UITableViewCellContentView:0x15673e40 )>","<NSLayoutConstraint:0x15599550 H:[UIButton:0x15598410]-(-60)-[UIButton:0x1568d8e0]>","<NSLayoutConstraint:0x155996e0 H:[UIButton:0x1568d8e0]-(-60)-[UIButton:0x15692d00]>","<NSLayoutConstraint:0x15599740 H:[UIButton:0x15692d00]-(-60)-[UIButton:0x15690fc0]>","<NSLayoutConstraint:0x155997a0 H:[UIButton:0x15690fc0]-(-60)-[UIButton:0x1568f100]>","<NSLayoutConstraint:0x15599800 H:[UIButton:0x1568f100]-(-60)-|   (Names: '|':UITableViewCellContentView:0x15673e40 )>"
)
 
Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x1558b4c0 H:[UIButton:0x15598410(20)]>
 
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
2014-10-09 03:04:07.633 Human Response[2972:781746] Unable to simultaneously satisfy constraints.
    Probably at least one of the constraints in the following list is one you don't want. Try this: (1) look at each constraint and try to figure out which you don't expect; (2) find the code that added the unwanted constraint or constraints and fix it. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand,refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints) 
(
    "<NSLayoutConstraint:0x155a2de0 H:[UIButton:0x155a2fc0(20)]>","<NSLayoutConstraint:0x155a33d0 H:[UIButton:0x155a32d0(20)]>","<NSLayoutConstraint:0x155a3750 H:[UIButton:0x155a3620(20)]>","<NSLayoutConstraint:0x155a1bc0 H:[UIButton:0x155a1a60(20)]>","<NSLayoutConstraint:0x155a3df0 H:[UIButton:0x155a3cc0(20)]>","<NSLayoutConstraint:0x156a4770 H:|-(-60)-[UIButton:0x155a3cc0]   (Names: '|':UITableViewCellContentView:0x155a2150 )>","<NSLayoutConstraint:0x156a47b0 H:[UIButton:0x155a3cc0]-(-60)-[UIButton:0x155a1a60]>","<NSLayoutConstraint:0x156a4840 H:[UIButton:0x155a1a60]-(-60)-[UIButton:0x155a3620]>","<NSLayoutConstraint:0x156a48c0 H:[UIButton:0x155a3620]-(-60)-[UIButton:0x155a32d0]>","<NSLayoutConstraint:0x156a4920 H:[UIButton:0x155a32d0]-(-60)-[UIButton:0x155a2fc0]>","<NSLayoutConstraint:0x1569fa50 H:[UIButton:0x155a2fc0]-(-60)-|   (Names: '|':UITableViewCellContentView:0x155a2150 )>"
)