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我正在创建一个子类UIView与AutoLayout无法获取它的背景颜色来改变我的生活。有人可以看看简单的代码，并验证我正在做的所有事情都需要在UIView（PCCGenericRatingView）的子类中完成。我读过SO，设置背景色只在帧被设置时才起作用。在评估约束之后，它不应该把我的框架设置为CGRectZero以外的其他东西吗？我正在打印viewDidAppear:生命周期方法中的视图框架，但它看起来像是CGRectZero。自定义UIView子类背景颜色未启用Autolayout设置
编辑： 当帧被传递到视图initWithFrame初始值设定项时，会显示背景颜色。否则，现在显示。
PCCGenericRatingView.h文件：
#import <UIKit/UIKit.h>
@interface PCCGenericRatingView : UIView
@property (nonatomic, strong) UILabel *titleLabel;
@property (nonatomic, strong) UILabel *messageLabel;
- (instancetype)initWithTitle:(NSString *)title andMessage:(NSString *)message;
+ (instancetype)genericRatingViewWithTitle:(NSString *)title andMessage:(NSString *)message;
@end
PCCGenericRatingView.m文件：
#import "PCCGenericRatingView.h"
@implementation PCCGenericRatingView
- (instancetype)initWithTitle:(NSString *)title andMessage:(NSString *)message {
if (self = [super init]) {
self.titleLabel = [[UILabel alloc] init];
self.messageLabel = [[UILabel alloc] init];
_titleLabel.text = title;
_messageLabel.text = message;
[self customizeView];
}
return self;
}
- (void)customizeView {
[self addSubview:_titleLabel];
[self addSubview:_messageLabel];
[_titleLabel setTranslatesAutoresizingMaskIntoConstraints:NO];
[_messageLabel setTranslatesAutoresizingMaskIntoConstraints:NO];
[_titleLabel setBackgroundColor:[UIColor yellowColor]];
[_messageLabel setBackgroundColor:[UIColor yellowColor]];
[_messageLabel setNumberOfLines:0];
[_messageLabel setTextAlignment:NSTextAlignmentCenter];
[_titleLabel setTextAlignment:NSTextAlignmentCenter];
[_titleLabel setFont:[UIFont fontWithName:@"HelveticaNeue-Bold" size:24.0f]];
[_messageLabel setFont:[UIFont fontWithName:@"HelveticaNeue-Thin" size:18.0f]];
}
+ (instancetype)genericRatingViewWithTitle:(NSString *)title andMessage:(NSString *)message {
return [[PCCGenericRatingView alloc] initWithTitle:title andMessage:message];
}
+ (BOOL)requiresConstraintBasedLayout {
return YES;
}
- (BOOL)translatesAutoresizingMaskIntoConstraints {
return NO;
}
-(void)updateConstraints {
CGRect windowRect = [UIScreen mainScreen].bounds;
NSDictionary *metrics = @{
@"height" : @(windowRect.size.height),
@"width" : @(windowRect.size.width)
};
NSDictionary *viewsDictionary = NSDictionaryOfVariableBindings(self);
[self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:[self(==width)]" options:0 metrics:metrics views:viewsDictionary]];
[self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:[self(==height)]" options:0 metrics:metrics views:viewsDictionary]];
[self addConstraint:[NSLayoutConstraint constraintWithItem:_titleLabel
attribute:NSLayoutAttributeTop
relatedBy:NSLayoutRelationEqual
toItem:self
attribute:NSLayoutAttributeTop
multiplier:1.0f
constant:35.0f]];
[self addConstraint:[NSLayoutConstraint constraintWithItem:_titleLabel
attribute:NSLayoutAttributeCenterX
relatedBy:NSLayoutRelationEqual
toItem:self
attribute:NSLayoutAttributeCenterX
multiplier:1.0f
constant:0.0f]];
[self addConstraint:[NSLayoutConstraint constraintWithItem:_titleLabel
attribute:NSLayoutAttributeWidth
relatedBy:NSLayoutRelationEqual
toItem:self
attribute:NSLayoutAttributeWidth
multiplier:1.0f
constant:0.0f]];
[self addConstraint:[NSLayoutConstraint constraintWithItem:_titleLabel
attribute:NSLayoutAttributeHeight
relatedBy:NSLayoutRelationEqual
toItem:nil
attribute:NSLayoutAttributeNotAnAttribute
multiplier:1.0f
constant:30.0f]];
[self addConstraint:[NSLayoutConstraint constraintWithItem:_messageLabel
attribute:NSLayoutAttributeBottom
relatedBy:NSLayoutRelationEqual
toItem:self
attribute:NSLayoutAttributeBottom
multiplier:1.0f
constant:-40.0f]];
[self addConstraint:[NSLayoutConstraint constraintWithItem:_messageLabel
attribute:NSLayoutAttributeCenterX
relatedBy:NSLayoutRelationEqual
toItem:self
attribute:NSLayoutAttributeCenterX
multiplier:1.0f
constant:0.0f]];
[self addConstraint:[NSLayoutConstraint constraintWithItem:_messageLabel
attribute:NSLayoutAttributeWidth
relatedBy:NSLayoutRelationEqual
toItem:self
attribute:NSLayoutAttributeWidth
multiplier:1.0f
constant:0.0f]];
[self addConstraint:[NSLayoutConstraint constraintWithItem:_messageLabel
attribute:NSLayoutAttributeHeight
relatedBy:NSLayoutRelationEqual
toItem:nil
attribute:NSLayoutAttributeNotAnAttribute
multiplier:1.0f
constant:50.0f]];
[super updateConstraints];
}
@end
父视图控制器：
#import "PCCLeaveRatingViewController.h"
#import "PCCGenericRating.h"
#import "PCCSliderRatingView.h"
@interface PCCLeaveRatingViewController()
@end
@implementation PCCLeaveRatingViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
self.dataSource = @[ [[PCCGenericRating alloc] initWithTitle:@"Easiness"
andMessage:@"WHAT A JOKERRRR"
andVariatons:@[ @"very easy", @"easy", @"moderate", @"hard", @"very hard"]],
];
[self initView];
}
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
}
- (void)initView {
[self setupConstraints];
[self addViewController];
}
- (void)setupConstraints {
CGRect windowFrame = [[UIApplication sharedApplication].delegate window].frame;
CGFloat windowWidth = windowFrame.size.width * self.dataSource.count;
[self.containerView addConstraint:[NSLayoutConstraint constraintWithItem:self.containerView
attribute:NSLayoutAttributeWidth
relatedBy:NSLayoutRelationEqual
toItem:nil
attribute:NSLayoutAttributeNotAnAttribute
multiplier:1.0f
constant:windowWidth]];
[self.containerView addConstraint:[NSLayoutConstraint constraintWithItem:self.containerView
attribute:NSLayoutAttributeHeight
relatedBy:NSLayoutRelationEqual
toItem:nil
attribute:NSLayoutAttributeNotAnAttribute
multiplier:1.0f
constant:windowFrame.size.height]];
}
- (void)addViewController {
PCCGenericRating *rating = self.dataSource[0];
PCCGenericRatingView *view = [PCCGenericRatingView genericRatingViewWithTitle:rating.title andMessage:rating.message];
[view setBackgroundColor:[UIColor yellowColor]];
const CGFloat viewWidth = [UIScreen mainScreen].bounds.size.width;
NSDictionary *viewsDictionary = NSDictionaryOfVariableBindings(view);
NSDictionary *metrics = @{ @"viewWidth" : @(viewWidth) };
[_containerView addSubview:view];
[view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:[view(==viewWidth)]" options:0 metrics:metrics views:viewsDictionary]];
[self.containerView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[view]|" options:0 metrics:nil views:viewsDictionary]];
}
@end