#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[superviewDidLoad];
//創建兩個view
UIView *view1 = [[UIViewalloc]init];
UIView *view2 = [[UIViewalloc]init];
view1.translatesAutoresizingMaskIntoConstraints =NO;
view2.translatesAutoresizingMaskIntoConstraints =NO;
//創建view1約束
NSLayoutConstraint *view1left = [NSLayoutConstraintconstraintWithItem:view1 attribute:NSLayoutAttributeLeadingrelatedBy:NSLayoutRelationEqualtoItem:self.viewattribute:NSLayoutAttributeLeadingmultiplier:1.0fconstant:0.0f];
NSLayoutConstraint *view1top = [NSLayoutConstraintconstraintWithItem:view1 attribute:NSLayoutAttributeToprelatedBy:NSLayoutRelationEqualtoItem:self.viewattribute:NSLayoutAttributeTopmultiplier:1.0fconstant:0.0f];
NSLayoutConstraint *view1width = [NSLayoutConstraintconstraintWithItem:view1 attribute:NSLayoutAttributeWidthrelatedBy:NSLayoutRelationEqualtoItem:nilattribute:NSLayoutAttributeNotAnAttributemultiplier:1.0fconstant:100.0f];
NSLayoutConstraint *view1height = [NSLayoutConstraintconstraintWithItem:view1 attribute:NSLayoutAttributeHeightrelatedBy:NSLayoutRelationEqualtoItem:nilattribute:NSLayoutAttributeNotAnAttributemultiplier:1.0fconstant:55.0f];
[self.viewaddSubview:view1];
//激活約束
view1left.active = YES;
view1top.active = YES;
view1width.active = YES;
view1height.active = YES;
//創建view2約束
NSLayoutConstraint *view2trail = [NSLayoutConstraintconstraintWithItem:view2 attribute:NSLayoutAttributeTrailingrelatedBy:NSLayoutRelationEqualtoItem:self.viewattribute:NSLayoutAttributeTrailingmultiplier:1.0fconstant:0.0f];
NSLayoutConstraint *view2top = [NSLayoutConstraintconstraintWithItem:view2 attribute:NSLayoutAttributeTrailingrelatedBy:NSLayoutRelationEqualtoItem:self.viewattribute:NSLayoutAttributeTrailingmultiplier:1.0fconstant:0.0f];
NSLayoutConstraint *view2width = [NSLayoutConstraintconstraintWithItem:view2 attribute:NSLayoutAttributeWidthrelatedBy:NSLayoutRelationEqualtoItem:nilattribute:NSLayoutAttributeNotAnAttributemultiplier:1.0fconstant:100.0f];
NSLayoutConstraint *view2height= [NSLayoutConstraintconstraintWithItem:view2 attribute:NSLayoutAttributeHeightrelatedBy:NSLayoutRelationEqualtoItem:nilattribute:NSLayoutAttributeNotAnAttributemultiplier:1.0fconstant:55.0f];
[self.viewaddSubview:view2];
//激活
view2trail.active = YES;
view2top.active = YES;
view2width.active =YES;
view2height.active = YES;
//設置背景顏色
[view1 setBackgroundColor:[UIColorgreenColor]];
[view2 setBackgroundColor:[UIColorlightGrayColor]];
}
- (void)didReceiveMemoryWarning {
[superdidReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
//如果想設置約束和父類的邊保持距離,比如說右邊和父類右邊保持64的距離 一定要寫成負的 因爲正的話就會超出父類右邊64
NSLayoutConstraint *doneRight = [NSLayoutConstraint constraintWithItem:doneBtn attribute:NSLayoutAttributeTrailing relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeTrailing multiplier:1.0f constant:-64.0f];