Auto Layout

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/*设置顶部图片*/

UIImageView *headerView = [[UIImageViewalloc] init];

headerView.translatesAutoresizingMaskIntoConstraints =NO;

headerView.image = [UIImageimageNamed:@"btn_scroll_picture"];

[self.viewaddSubview:headerView];

//设置水平居中

NSLayoutConstraint *headerViewLayoutConstraint = [NSLayoutConstraintconstraintWithItem:headerView attribute:NSLayoutAttributeCenterXrelatedBy:NSLayoutRelationEqualtoItem:self.viewattribute:NSLayoutAttributeCenterXmultiplier:1.0fconstant:0.0f];

[self.viewaddConstraint:headerViewLayoutConstraint];

//设置上边距

headerViewLayoutConstraint = [NSLayoutConstraintconstraintWithItem:headerView attribute:NSLayoutAttributeToprelatedBy:NSLayoutRelationEqualtoItem:self.topLayoutGuideattribute:NSLayoutAttributeBottommultiplier:1.0fconstant:20];

[self.viewaddConstraint:headerViewLayoutConstraint];

//设置图片宽高

headerViewLayoutConstraint = [NSLayoutConstraintconstraintWithItem:headerView attribute:NSLayoutAttributeWidthrelatedBy:NSLayoutRelationEqualtoItem:nilattribute:NSLayoutAttributeNotAnAttributemultiplier:1.0fconstant:[UIImageimageNamed:@"btn_scroll_picture"].size.width];

[self.viewaddConstraint:headerViewLayoutConstraint];

headerViewLayoutConstraint = [NSLayoutConstraintconstraintWithItem:headerView attribute:NSLayoutAttributeHeightrelatedBy:NSLayoutRelationEqualtoItem:nilattribute:NSLayoutAttributeNotAnAttributemultiplier:1.0fconstant:[UIImageimageNamed:@"btn_scroll_picture"].size.height];

[self.viewaddConstraint:headerViewLayoutConstraint];

/*设置底部按钮*/

UIButton *downButton = [UIButtonbuttonWithType:UIButtonTypeRoundedRect];

downButton.translatesAutoresizingMaskIntoConstraints =NO;

downButton.backgroundColor = [UIColorwhiteColor];

downButton.layer.cornerRadius =5;

downButton.titleLabel.font = [UIFontsystemFontOfSize:18];

[downButtonsetTitle:@"Get Started"forState:UIControlStateNormal];

[self.viewaddSubview:downButton];

NSArray *downButtonConstraintX = [NSLayoutConstraintconstraintsWithVisualFormat:@"H:|-15-[downButton]-15-|"options:0metrics:nilviews:NSDictionaryOfVariableBindings(downButton)];

[self.viewaddConstraints:downButtonConstraintX];

id bottomView =self.bottomLayoutGuide;

NSArray *downButtonConstraintY = [NSLayoutConstraintconstraintsWithVisualFormat:@"V:|-(>=0)-[downButton(43)]-(>=28)-[bottomView]-|"options:0metrics:nilviews:NSDictionaryOfVariableBindings(bottomView, downButton)];

[self.viewaddConstraints:downButtonConstraintY];

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