iOS AutoLayout

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- (void)viewDidLoad {

UIButton *btnSubmit=[UIButtonbuttonWithType:UIButtonTypeRoundedRect];

[btnSubmit setTitle:@"Submit"forState:UIControlStateNormal];

[btnSubmit setTranslatesAutoresizingMaskIntoConstraints:NO];

btnSubmit.layer.borderWidth =1.0;

btnSubmit.layer.borderColor = [UIColorgrayColor].CGColor;

btnSubmit.layer.backgroundColor = [UIColorgrayColor].CGColor;

[self.viewaddSubview:btnSubmit];

UIButton *btnCancel=[UIButtonbuttonWithType:UIButtonTypeRoundedRect];

[btnCancel setTitle:@"Cancel"forState:UIControlStateNormal];

[btnCancel setTranslatesAutoresizingMaskIntoConstraints:NO];

btnCancel.layer.borderWidth =1.0;

btnCancel.layer.borderColor = [UIColorgrayColor].CGColor;

btnCancel.layer.backgroundColor = [UIColorredColor].CGColor;

[self.viewaddSubview:btnCancel];

NSDictionary *views=NSDictionaryOfVariableBindings(btnSubmit,btnCancel);

[self.viewaddConstraints:

[NSLayoutConstraintconstraintsWithVisualFormat:@"H:|-(==20)-[btnSubmit(>=80)]"

options:0metrics:nilviews:views]];//距屏幕左边20px，宽度自由缩放

[self.viewaddConstraints:

[NSLayoutConstraintconstraintsWithVisualFormat:@"V:|-(==50)-[btnSubmit(30)]"

options:0metrics:nilviews:views]];//距屏幕顶部50px，高度30px

[self.viewaddConstraints:

[NSLayoutConstraintconstraintsWithVisualFormat:@"H:[btnCancel(==80)]"

options:0metrics:nilviews:views]];//宽度20px(下面布局水平居中)

[self.viewaddConstraints:

[NSLayoutConstraintconstraintsWithVisualFormat:@"V:|-(50)-[btnCancel(==btnSubmit)]"

options:0metrics:nilviews:views] ];//距屏幕顶部50px，两按钮宽度相等

[self.viewaddConstraint:

[NSLayoutConstraintconstraintWithItem:btnCancel

attribute:NSLayoutAttributeCenterX

relatedBy:NSLayoutRelationEqual

toItem:self.view

attribute:NSLayoutAttributeCenterX

multiplier:1

constant:0]];//btnCancel水平居中

[self.viewaddConstraint:

[NSLayoutConstraintconstraintWithItem:btnSubmit

attribute:NSLayoutAttributeRight

relatedBy:NSLayoutRelationEqual

toItem:btnCancel

attribute:NSLayoutAttributeLeft

multiplier:1

constant:-20]];//btnSubmit与btnCancel水平间距20pix

[superviewDidLoad];

}

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