Ios 如何在objective c中将imageView框架的矩形作为子视图

如何在objective c中将imageView框架的矩形作为子视图？

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内部视图控制器我有一个视图，在该视图内我想放置一个imageView，imageView框架应小于视图框架的框架，imageView应位于视图框架的中心。

首先，设置imageView的大小，其次，设置imageView的坐标，下面是代码：

    UIView *container = [[UIView alloc] initWithFrame:CGRectMake(100, 100, 200, 200)];
    container.backgroundColor = [UIColor blueColor];
    [self.view addSubview:container];

    UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
    imageView.backgroundColor = [UIColor redColor];
    [container addSubview:imageView];

    CGRect f = imageView.frame;
    f.origin.x = CGRectGetWidth(container.bounds) / 2.0f - CGRectGetWidth(f) / 2.0;
    f.origin.y = CGRectGetHeight(container.bounds) / 2.0f - CGRectGetHeight(f) / 2.0f;
    imageView.frame = f;

或者设置imageView的中心（警告！imageView将添加到

self.view

！）

此外，还可以使用自动布局，如下所示：

    UIView *container = [[UIView alloc] initWithFrame:CGRectMake(100, 100, 200, 200)];
    container.backgroundColor = [UIColor blueColor];
    [self.view addSubview:container];

    UIImageView *imageView = [[UIImageView alloc] init];
    imageView.backgroundColor = [UIColor redColor];
    [container addSubview:imageView];
    imageView.translatesAutoresizingMaskIntoConstraints = NO;

    NSLayoutConstraint *c1 = [NSLayoutConstraint constraintWithItem:imageView attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1 constant:100];
    NSLayoutConstraint *c2 = [NSLayoutConstraint constraintWithItem:imageView attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1 constant:100];
    NSLayoutConstraint *c3 = [NSLayoutConstraint constraintWithItem:imageView attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:container attribute:NSLayoutAttributeCenterX multiplier:1 constant:0];
    NSLayoutConstraint *c4 = [NSLayoutConstraint constraintWithItem:imageView attribute:NSLayoutAttributeCenterY relatedBy:NSLayoutRelationEqual toItem:container attribute:NSLayoutAttributeCenterY multiplier:1 constant:0];
    c1.active = YES;
    c2.active = YES;
    c3.active = YES;
    c4.active = YES;

上述所有解决方案都将imageView置于

容器的中心


    UIView *container = [[UIView alloc] initWithFrame:CGRectMake(100, 100, 200, 200)];
    container.backgroundColor = [UIColor blueColor];
    [self.view addSubview:container];

    UIImageView *imageView = [[UIImageView alloc] init];
    imageView.backgroundColor = [UIColor redColor];
    [container addSubview:imageView];
    imageView.translatesAutoresizingMaskIntoConstraints = NO;

    NSLayoutConstraint *c1 = [NSLayoutConstraint constraintWithItem:imageView attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1 constant:100];
    NSLayoutConstraint *c2 = [NSLayoutConstraint constraintWithItem:imageView attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1 constant:100];
    NSLayoutConstraint *c3 = [NSLayoutConstraint constraintWithItem:imageView attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:container attribute:NSLayoutAttributeCenterX multiplier:1 constant:0];
    NSLayoutConstraint *c4 = [NSLayoutConstraint constraintWithItem:imageView attribute:NSLayoutAttributeCenterY relatedBy:NSLayoutRelationEqual toItem:container attribute:NSLayoutAttributeCenterY multiplier:1 constant:0];
    c1.active = YES;
    c2.active = YES;
    c3.active = YES;
    c4.active = YES;