translatesAutoresizingMaskIntoConstraints

（1）
UIView *view1 = [[UIView alloc] initWithFrame:CGRectMake(10, 50, 100, 100)];
view1.backgroundColor = [UIColor redColor];
view1.translatesAutoresizingMaskIntoConstraints = NO;
[self.view addSubview:view1];

   [view1 addConstraint:[NSLayoutConstraint constraintWithItem:view1 attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1 constant:300]];
   [view1 addConstraint:[NSLayoutConstraint constraintWithItem:view1 attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1 constant:300]];


//
//
    UIView *view2 = [[UIView alloc] initWithFrame:CGRectMake(100,200 , 33, 33)];
    view2.backgroundColor = [UIColor orangeColor];
    [self.view addSubview:view2];
    view2.translatesAutoresizingMaskIntoConstraints = NO;

//    // 宽度  高度
    NSLayoutConstraint *heightConstrait = [NSLayoutConstraint constraintWithItem:view2 attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:view1 attribute:NSLayoutAttributeHeight multiplier:1  constant:0];
    // 宽度
    NSLayoutConstraint *widthConstrait = [NSLayoutConstraint constraintWithItem:view2 attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual
    toItem:view1 attribute:NSLayoutAttributeWidth  multiplier:1 constant:0];

    NSLayoutConstraint *constraintTop = [NSLayoutConstraint constraintWithItem:view2 attribute:NSLayoutAttributeLeading relatedBy:NSLayoutRelationEqual toItem:view1 attribute:NSLayoutAttributeLeading multiplier:1 constant:0];
    NSLayoutConstraint *constraintBottom = [NSLayoutConstraint constraintWithItem:view2 attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:view1 attribute:NSLayoutAttributeBottom multiplier:1 constant:40];

    [self.view addConstraints:@[heightConstrait,widthConstrait]];
    [self.view addConstraint:constraintTop];
    [self.view addConstraint:constraintBottom];

（2）

 UIView *view1 = [[UIView alloc] initWithFrame:CGRectMake(10, 50, 100, 100)];
    view1.backgroundColor = [UIColor redColor];
    view1.translatesAutoresizingMaskIntoConstraints = NO;
    [self.view addSubview:view1];


   [view1 addConstraint:[NSLayoutConstraint constraintWithItem:view1 attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1 constant:300]];
//   [view1 addConstraint:[NSLayoutConstraint constraintWithItem:view1 attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1 constant:300]];


//
//
    UIView *view2 = [[UIView alloc] initWithFrame:CGRectMake(100,200 , 33, 33)];
    view2.backgroundColor = [UIColor orangeColor];
    [self.view addSubview:view2];
    view2.translatesAutoresizingMaskIntoConstraints = NO;

//    // 宽度  高度
    NSLayoutConstraint *heightConstrait = [NSLayoutConstraint constraintWithItem:view2 attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:view1 attribute:NSLayoutAttributeHeight multiplier:1  constant:0];
    // 宽度
    NSLayoutConstraint *widthConstrait = [NSLayoutConstraint constraintWithItem:view2 attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual
    toItem:view1 attribute:NSLayoutAttributeWidth  multiplier:1 constant:0];

    NSLayoutConstraint *constraintTop = [NSLayoutConstraint constraintWithItem:view2 attribute:NSLayoutAttributeLeading relatedBy:NSLayoutRelationEqual toItem:view1 attribute:NSLayoutAttributeLeading multiplier:1 constant:0];
    NSLayoutConstraint *constraintBottom = [NSLayoutConstraint constraintWithItem:view2 attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:view1 attribute:NSLayoutAttributeBottom multiplier:1 constant:40];

    [self.view addConstraints:@[heightConstrait,widthConstrait]];
    [self.view addConstraint:constraintTop];
    [self.view addConstraint:constraintBottom];

（3）
UIView *view1 = [[UIView alloc] initWithFrame:CGRectMake(10, 50, 100, 100)];
view1.backgroundColor = [UIColor redColor];
view1.translatesAutoresizingMaskIntoConstraints = YES;
[self.view addSubview:view1];

   [view1 addConstraint:[NSLayoutConstraint constraintWithItem:view1 attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1 constant:300]];
   [view1 addConstraint:[NSLayoutConstraint constraintWithItem:view1 attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1 constant:300]];


//
//
    UIView *view2 = [[UIView alloc] initWithFrame:CGRectMake(100,200 , 33, 33)];
    view2.backgroundColor = [UIColor orangeColor];
    [self.view addSubview:view2];
    view2.translatesAutoresizingMaskIntoConstraints = NO;

//    // 宽度  高度
    NSLayoutConstraint *heightConstrait = [NSLayoutConstraint constraintWithItem:view2 attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:view1 attribute:NSLayoutAttributeHeight multiplier:1  constant:0];
    // 宽度
    NSLayoutConstraint *widthConstrait = [NSLayoutConstraint constraintWithItem:view2 attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual
    toItem:view1 attribute:NSLayoutAttributeWidth  multiplier:1 constant:0];

    NSLayoutConstraint *constraintTop = [NSLayoutConstraint constraintWithItem:view2 attribute:NSLayoutAttributeLeading relatedBy:NSLayoutRelationEqual toItem:view1 attribute:NSLayoutAttributeLeading multiplier:1 constant:0];
    NSLayoutConstraint *constraintBottom = [NSLayoutConstraint constraintWithItem:view2 attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:view1 attribute:NSLayoutAttributeBottom multiplier:1 constant:40];

    [self.view addConstraints:@[heightConstrait,widthConstrait]];
    [self.view addConstraint:constraintTop];
    [self.view addConstraint:constraintBottom];

translatesAutoresizingMaskIntoConstraints 约束与Autosizing控制。。。
当打开约束的时候，要约束条件完全，否则可能试图丢失。。。。。