UIVIew里面的UIButton沒有集中在iPhone應用程序中

Question

我實際上是以編程方式設置一個自定義的UIView，它將包含幾個UIButton，這樣可以正常工作。 但我要做的是將UIButton置於我以編程方式創建的子自定義UIView中。 這是我實際使用的代碼

//UIView used as a parent for the blurrEffectView
blurredPowerDown = [[UIView alloc] initWithFrame:CGRectMake(0, 0, [[UIScreen mainScreen] bounds].size.width, [[UIScreen mainScreen] bounds].size.height)];
                    blurredPowerDown.backgroundColor = [UIColor clearColor];

                    //I'm calling this for applying my custom view on top of other application (yes this is jailbreak development but issue is not related at it at all
                    window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
                    window.windowLevel = UIWindowLevelAlert + 2;
                    [window setHidden:NO];
                    [window setAlpha:1.0];
                    [window setBackgroundColor:[UIColor clearColor]];
                    [window addSubview:blurredPowerDown];

                    //Code to get blur depending of what is behind the view
                    blur = [UIBlurEffect effectWithStyle:UIBlurEffectStyleDark];
                    blurEffectView = [[UIVisualEffectView alloc]initWithEffect:blur];
                    blurEffectView.frame = blurredPowerDown.bounds;
                    blurEffectView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
                    [blurEffectView setAlpha:0.0];
                    [blurredPowerDown addSubview:blurEffectView];

                    [UIView animateWithDuration:0.5 delay:0.0 options:UIViewAnimationOptionCurveEaseIn animations:^{

            [blurEffectView setAlpha:1.0];

            }
            completion:^(BOOL finished) {

            }];

                    //This is the view I use to center all the button that I will add (in red on the following picture)
                    centerView = [[UIView alloc] init];
                    [centerView setTranslatesAutoresizingMaskIntoConstraints:NO];
                    centerView.backgroundColor = [UIColor redColor];

                    [blurEffectView addSubview:centerView];

                    [blurEffectView addConstraint:[NSLayoutConstraint constraintWithItem:centerView
                                                      attribute:NSLayoutAttributeWidth
                                                      relatedBy:NSLayoutRelationEqual
                                                         toItem:blurEffectView
                                                      attribute:NSLayoutAttributeWidth
                                                     multiplier:0.7
                                                       constant:0]];

                    [blurEffectView addConstraint:[NSLayoutConstraint constraintWithItem:centerView
                                                      attribute:NSLayoutAttributeHeight
                                                      relatedBy:NSLayoutRelationEqual
                                                         toItem:blurEffectView
                                                      attribute:NSLayoutAttributeHeight
                                                     multiplier:0.5
                                                       constant:0]];


                    [blurEffectView addConstraint:[NSLayoutConstraint constraintWithItem:centerView
                                                      attribute:NSLayoutAttributeCenterX
                                                      relatedBy:NSLayoutRelationEqual
                                                         toItem:blurEffectView
                                                      attribute:NSLayoutAttributeCenterX
                                                     multiplier:1.0
                                                       constant:0.0]];


                    [blurEffectView addConstraint:[NSLayoutConstraint constraintWithItem:centerView
                                                      attribute:NSLayoutAttributeCenterY
                                                      relatedBy:NSLayoutRelationEqual
                                                         toItem:blurEffectView
                                                      attribute:NSLayoutAttributeCenterY
                                                     multiplier:1.0
                                                       constant:0.0]];

                    //And this is the button that cause me issue
                    UIButton *cancelButton = [UIButton buttonWithType:UIButtonTypeCustom];
                    [cancelButton addTarget:self action:@selector(cancelView) forControlEvents:UIControlEventTouchUpInside];
                    [cancelButton setTitle:@"Cancel" forState:UIControlStateNormal];
                    cancelButton.frame = CGRectMake(0, 0, 80, 80);
                    cancelButton.clipsToBounds = YES;
                    cancelButton.layer.cornerRadius = 80/2.0f;
                    cancelButton.layer.borderColor=[UIColor whiteColor].CGColor;
                    cancelButton.layer.borderWidth=2.0f;


                    [centerView addSubview:cancelButton];

                    //Constraints removed as per UditS suggestion
                    [centerView addConstraint:[NSLayoutConstraint constraintWithItem:cancelButton
                                                      attribute:NSLayoutAttributeWidth
                                                      relatedBy:NSLayoutRelationEqual
                                                         toItem:centerView
                                                      attribute:NSLayoutAttributeWidth
                                                     multiplier:1.0
                                                       constant:0]];

                    [centerView addConstraint:[NSLayoutConstraint constraintWithItem:cancelButton
                                                      attribute:NSLayoutAttributeHeight
                                                      relatedBy:NSLayoutRelationEqual
                                                         toItem:centerView
                                                      attribute:NSLayoutAttributeHeight
                                                     multiplier:1.0
                                                       constant:0]];


                    [centerView addConstraint:[NSLayoutConstraint constraintWithItem:cancelButton
                                                      attribute:NSLayoutAttributeCenterX
                                                      relatedBy:NSLayoutRelationEqual
                                                         toItem:centerView
                                                      attribute:NSLayoutAttributeCenterX
                                                     multiplier:1.0
                                                       constant:0.0]];


                    [centerView addConstraint:[NSLayoutConstraint constraintWithItem:cancelButton
                                                      attribute:NSLayoutAttributeCenterY
                                                      relatedBy:NSLayoutRelationEqual
                                                         toItem:centerView
                                                      attribute:NSLayoutAttributeCenterY
                                                     multiplier:1.0
                                                       constant:0.0]];

這是它的功能截圖

我真的不明白為什么我的UIButton始終保持在左上角（就好像它沒有放置約束但我添加了它們！）

我真的很絕望！

在此先感謝您的幫助

編輯：如果我設置cancelButton.center = centerView.center; 這是我得到的：

EDIT2：正如所建議的那樣，我設置了cancelButton.translatesAutoresizingMaskIntoConstraints = NO; 但結果如下：

編輯3：我們提前^^感謝@UditS建議（刪除高度和寬度限制）按鈕居中，但現在邊框很奇怪

Answer 1

您應該禁用轉換autoresizingMask到您的按鈕的約束：

cancelButton.translatesAutoresizingMaskIntoConstraints = NO;

附加：如果要將按鈕的寬度和高度設置為80px，則應在這些上替換cancelButton的2個第一個約束：

[cancelButton addConstraint:[NSLayoutConstraint constraintWithItem:cancelButton
                                                       attribute:NSLayoutAttributeWidth
                                                       relatedBy:NSLayoutRelationEqual
                                                          toItem:nil
                                                       attribute:NSLayoutAttributeNotAnAttribute
                                                      multiplier:1.0
                                                        constant:80]];

[cancelButton addConstraint:[NSLayoutConstraint constraintWithItem:cancelButton
                                                         attribute:NSLayoutAttributeHeight
                                                         relatedBy:NSLayoutRelationEqual
                                                            toItem:nil
                                                         attribute:NSLayoutAttributeNotAnAttribute
                                                        multiplier:1.0
                                                          constant:80]];

Answer 2

問題可能在於你的CenterY約束，就像在你的代碼中你正在使cancelButton的CenterY等於centerView的CenterX。

所以代替

                [centerView addConstraint:[NSLayoutConstraint constraintWithItem:cancelButton
                                                  attribute:NSLayoutAttributeCenterY
                                                  relatedBy:NSLayoutRelationEqual
                                                     toItem:centerView
                                                  attribute:NSLayoutAttributeCenterX
                                                 multiplier:1.0
                                                   constant:0.0]];

你應該有

                [centerView addConstraint:[NSLayoutConstraint constraintWithItem:cancelButton
                                                  attribute:NSLayoutAttributeCenterY
                                                  relatedBy:NSLayoutRelationEqual
                                                     toItem:centerView
                                                  attribute:NSLayoutAttributeCenterY
                                                 multiplier:1.0
                                                   constant:0.0]];

根據設置后的編輯

cancelButton.translatesAutoresizingMaskIntoConstraints = NO;

按鈕將占據centerView全寬和高度，因為您通過以下約束進行設置

                [centerView addConstraint:[NSLayoutConstraint constraintWithItem:cancelButton
                                                  attribute:NSLayoutAttributeWidth
                                                  relatedBy:NSLayoutRelationEqual
                                                     toItem:centerView
                                                  attribute:NSLayoutAttributeWidth
                                                 multiplier:1.0
                                                   constant:0]];

                [centerView addConstraint:[NSLayoutConstraint constraintWithItem:cancelButton
                                                  attribute:NSLayoutAttributeHeight
                                                  relatedBy:NSLayoutRelationEqual
                                                     toItem:centerView
                                                  attribute:NSLayoutAttributeHeight
                                                 multiplier:1.0
                                                   constant:0]];

刪除這些約束並添加對稱按鈕的恆定高度和寬度。

根據編輯3 ，嘗試向按鈕添加寬度和高度約束。

                [cancelButton addConstraint:[NSLayoutConstraint constraintWithItem:cancelButton
                                                  attribute:NSLayoutAttributeWidth
                                                  relatedBy:NSLayoutRelationEqual
                                                     toItem:nil
                                                  attribute:NSLayoutAttributeNotAnAttribute
                                                 multiplier:1.0
                                                   constant:80.0]];

                [cancelButton addConstraint:[NSLayoutConstraint constraintWithItem:cancelButton
                                                  attribute:NSLayoutAttributeHeight
                                                  relatedBy:NSLayoutRelationEqual
                                                     toItem:nil
                                                  attribute:NSLayoutAttributeNotAnAttribute
                                                 multiplier:1.0
                                                   constant:80.0]];