iOS 視圖約束常用的宏定義

#pragma mark - Constraints
/*
 *自適應向佈局約束的轉化關閉
 */
#define PREPCONSTRAINTS(VIEW) [VIEW setTranslatesAutoresizingMaskIntoConstraints:NO]
#define CONSTRAIN(PARENT, VIEW, FORMAT) [PARENT addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:(FORMAT) options:0 metrics:nil views:NSDictionaryOfVariableBindings(VIEW)]]
#define CONSTRAIN_VIEWS(PARENT, FORMAT, VIEWBINDINGS) [PARENT addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:(FORMAT) options:0 metrics:nil views:VIEWBINDINGS]]

// Stretch across axis
#define STRETCH_VIEW_H(PARENT, VIEW) CONSTRAIN(PARENT, VIEW, @"H:|["#VIEW"(>=0)]|")
#define STRETCH_VIEW_V(PARENT, VIEW) CONSTRAIN(PARENT, VIEW, @"V:|["#VIEW"(>=0)]|")
#define STRETCH_VIEW(PARENT, VIEW) {STRETCH_VIEW_H(PARENT, VIEW); STRETCH_VIEW_V(PARENT, VIEW);}

// Center along axis 沿中心軸
/*
 *與父視圖中心軸水平方向對齊
 */
#define CENTER_VIEW_H(PARENT, VIEW) [PARENT addConstraint:[NSLayoutConstraint constraintWithItem:VIEW attribute: NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:PARENT attribute:NSLayoutAttributeCenterX multiplier:1.0f constant:0.0f]]
/*
 *與父視圖中心軸垂直方向對齊
 */
#define CENTER_VIEW_V(PARENT, VIEW) [PARENT addConstraint:[NSLayoutConstraint constraintWithItem:VIEW attribute: NSLayoutAttributeCenterY relatedBy:NSLayoutRelationEqual toItem:PARENT attribute:NSLayoutAttributeCenterY multiplier:1.0f constant:0.0f]]
/*
 *以父視圖的中心點爲視圖中心
 */
#define CENTER_VIEW(PARENT, VIEW) {CENTER_VIEW_H(PARENT, VIEW); CENTER_VIEW_V(PARENT, VIEW);}
/*
 *據裏父視圖的中心點Y方向的距離
 */
#define CENTER_VIEW_V_CONSTANT(PARENT, VIEW, CONSTANT) [PARENT addConstraint:[NSLayoutConstraint constraintWithItem:VIEW attribute: NSLayoutAttributeCenterY relatedBy:NSLayoutRelationEqual toItem:PARENT attribute:NSLayoutAttributeCenterY multiplier:1.0f constant:CONSTANT]]

// Align to parent 與父視圖對齊
/*
 *和父視圖的左邊對齊
 */
#define ALIGN_VIEW_LEFT(PARENT, VIEW) [PARENT addConstraint:[NSLayoutConstraint constraintWithItem:VIEW attribute: NSLayoutAttributeLeft relatedBy:NSLayoutRelationEqual toItem:PARENT attribute:NSLayoutAttributeLeft multiplier:1.0f constant:0.0f]]
/*
 *和父視圖的右邊對齊
 */
#define ALIGN_VIEW_RIGHT(PARENT, VIEW) [PARENT addConstraint:[NSLayoutConstraint constraintWithItem:VIEW attribute: NSLayoutAttributeRight relatedBy:NSLayoutRelationEqual toItem:PARENT attribute:NSLayoutAttributeRight multiplier:1.0f constant:0.0f]]
/*
 *和父視圖的頂部對齊
 */
#define ALIGN_VIEW_TOP(PARENT, VIEW) [PARENT addConstraint:[NSLayoutConstraint constraintWithItem:VIEW attribute: NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:PARENT attribute:NSLayoutAttributeTop multiplier:1.0f constant:0.0f]]
/*
 *和父視圖的底部對齊
 */
#define ALIGN_VIEW_BOTTOM(PARENT, VIEW) [PARENT addConstraint:[NSLayoutConstraint constraintWithItem:VIEW attribute: NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:PARENT attribute:NSLayoutAttributeBottom multiplier:1.0f constant:0.0f]]
/*
 *和父視圖的右邊距恆定不變
 */
#define ALIGN_VIEW_LEFT_CONSTANT(PARENT, VIEW, CONSTANT) [PARENT addConstraint:[NSLayoutConstraint constraintWithItem:VIEW attribute: NSLayoutAttributeLeft relatedBy:NSLayoutRelationEqual toItem:PARENT attribute:NSLayoutAttributeLeft multiplier:1.0f constant:CONSTANT]]
/*
 *和父視圖的左邊距恆定不變
 */
#define ALIGN_VIEW_RIGHT_CONSTANT(PARENT, VIEW, CONSTANT) [PARENT addConstraint:[NSLayoutConstraint constraintWithItem:VIEW attribute: NSLayoutAttributeRight relatedBy:NSLayoutRelationEqual toItem:PARENT attribute:NSLayoutAttributeRight multiplier:1.0f constant:CONSTANT]]
/*
 *和父視圖的頂部距離恆定不變
 */
#define ALIGN_VIEW_TOP_CONSTANT(PARENT, VIEW, CONSTANT) [PARENT addConstraint:[NSLayoutConstraint constraintWithItem:VIEW attribute: NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:PARENT attribute:NSLayoutAttributeTop multiplier:1.0f constant:CONSTANT]]
/*
 *和父視圖的底部距離恆定不變
 */
#define ALIGN_VIEW_BOTTOM_CONSTANT(PARENT, VIEW, CONSTANT) [PARENT addConstraint:[NSLayoutConstraint constraintWithItem:VIEW attribute: NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:PARENT attribute:NSLayoutAttributeBottom multiplier:1.0f constant:CONSTANT]]

// Set Size 設置大小
#define CONSTRAIN_WIDTH(VIEW, WIDTH) CONSTRAIN(VIEW, VIEW, @"H:["#VIEW"(=="#WIDTH")]")
#define CONSTRAIN_HEIGHT(VIEW, HEIGHT) CONSTRAIN(VIEW, VIEW, @"V:["#VIEW"(=="#HEIGHT")]")
#define CONSTRAIN_SIZE(VIEW, HEIGHT, WIDTH) {CONSTRAIN_WIDTH(VIEW, WIDTH); CONSTRAIN_HEIGHT(VIEW, HEIGHT);}

// Set Aspect
#define CONSTRAIN_ASPECT(VIEW, ASPECT) [VIEW addConstraint:[NSLayoutConstraint constraintWithItem:VIEW attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:VIEW attribute:NSLayoutAttributeHeight multiplier:(ASPECT) constant:0.0f]]

能力有限，如有錯誤，歡迎指正,補充，謝謝