UIView和intrinsicContentSize

Question

UIView是否创造了intrinsicContentSize？

我创建了一个UIView contentView.我不给它约束大小:

UIView *contentView = [UIView new];
[contentView setTranslatesAutoresizingMaskIntoConstraints:NO];
contentView.backgroundColor = [UIColor orangeColor];

我创建了另一个UIView subview01.我给它约束大小并将其添加到我的contentView:

UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
[imageView setTranslatesAutoresizingMaskIntoConstraints:NO];
imageView.userInteractionEnabled = TRUE;
imageView.backgroundColor = [UIColor clearColor];

[imageView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:[imageView(WIDTH)]"
                                                                  options:0
                                                                  metrics:@{@"WIDTH" : [NSNumber numberWithFloat:imageSize.width]}
                                                                    views:NSDictionaryOfVariableBindings(imageView)]];

[imageView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:[imageView(HEIGHT)]"
                                                                  options:0
                                                                  metrics:@{@"HEIGHT" : [NSNumber numberWithFloat:imageSize.height]}
                                                                    views:NSDictionaryOfVariableBindings(imageView)]];


[contentView addSubview:imageView];

contentView确实没有任何大小.我想intrinsicContentSize是假设要计算显示所有子视图所需的大小并自行调整大小？就像UILabel如何调整大小以显示其所有文本一样？

Answer 1

不,UIView没有intrinsicContentSize.按钮和标签可以,因为系统很容易根据字符串和/或图像来计算大小.对于UIView,通常需要4个约束来完全描述其位置和大小.