iOS 以编程方式居中对象

Question

我正在为 iPhone 6 Plus 支持更新应用程序。在以编程方式设置的其中一个视图中，运行在 5S 或以下版本中所有视图都以它们应有的方式居中。然而，在 6 Plus 上，它略微向左移动。我如何调整此代码以使其在所有版本中都水平居中？

[self.logInView.usernameField setFrame:CGRectMake(35.0f, 125.0f, 250.0f, 50.0f)];
[self.logInView.passwordField setFrame:CGRectMake(35.0f, 175.0f, 250.0f, 50.0f)];
[self.fieldsBackground setFrame:CGRectMake(35.0f, 125.0f, 250.0f, 100.0f)];
[self.logInView.logInButton setFrame:CGRectMake(35.0f, 235.0f, 250.0f, 40.0f)];

Answer 1

您可以使用 "bounds" 和 "center":

self.logInView.usernameField.bounds = CGRectMake(0,0,250,50);
self.logInView.usernameField.center = CGPointMake(160, 150);

Answer 2

答案很简单……使用自动布局。但是如果你不知道如何使用它，试试这个：

首先，创建一些定义：

#define IS_IPHONE (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)
#define IS_IPADDEVICE (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
#define IS_IPHONE_4 (IS_IPHONE && [[UIScreen mainScreen] bounds].size.height == 480.0)
#define IS_IPHONE_5 (IS_IPHONE && [[UIScreen mainScreen] bounds].size.height == 568.0)
#define IS_IPHONE_6 (IS_IPHONE && [[UIScreen mainScreen] bounds].size.height == 667.0)
#define IS_IPHONE_6_PLUS (IS_IPHONE && [[UIScreen mainScreen] bounds].size.height == 736.0)
#define IS_IPAD (IS_IPADDEVICE && [[UIScreen mainScreen] bounds].size.height == 1024.0)

然后创建一个简单的 if 语句：

   if (IS_IPHONE_4) {
        // iPhone 4
    } else if (IS_IPHONE_5) {
        // iPhone 5
    } else if (IS_IPHONE_6) {
        // iPhone 6
    } else if (IS_IPHONE_6_PLUS) {
        // iPhone 6 plus
    } else if (IS_IPAD) {
        // iPad
    } else {
        // other device
    }

如果我想使对象居中，我使用 frame 方法：

theobject.frame = CGRectMake((theobject.frame.size.width/2) - (theobject.image.size.width/2), 20, theobject.image.size.width, theobject.image.size.height);

希望这个回答对您有所帮助！ ;)

Answer 3

[self.logInView.usernameField setFrame:CGRectMake(self.view.center.x - 125, 0, 250.0f, 50.0f);];
[self.logInView.passwordField setFrame:CGRectMake(self.view.center.x - 125, 175.0f, 250.0f, 50.0f)];
[self.fieldsBackground setFrame:CGRectMake(self.view.center.x - 125, 125.0f, 250.0f, 100.0f)];
[self.logInView.logInButton setFrame:CGRectMake(self.view.center.x - 125, 235.0f, 250.0f, 40.0f)];

您可以使用此代码在所有 iOS 设备上放置 UI 水平井。

Answer 4

您似乎正在更新 Parse loginView。我遇到了同样的问题......让默认的 loginView 适应所有屏幕设备尺寸真的很痛苦。我将分享一些代码，希望对您有所帮助。这应该在 Parse 的 IOS Helper Page 上。 将其放入您的 .m 文件中

- (void)viewDidLayoutSubviews {
    [super viewDidLayoutSubviews];

//Returns the screen dimensions (in points) of the user's current device
CGRect screenBounds = [[UIScreen mainScreen] bounds];


//Finds to see if the user has an iPhone 4s, and then set's the layout if they do
if(screenBounds.size.height==480)
{
    [self.logInView.logInButton setFrame:CGRectMake(self.view.center.x - 125, 300.0f, 250.0f, 50.0f)];
    [self.logInView.usernameField setFrame:CGRectMake(self.view.center.x - 125, 165.0f, 250.0f, 50.0f)];
    [self.logInView.passwordField setFrame:CGRectMake(self.view.center.x - 125, 215.0f, 250.0f, 50.0f)];
    [self.logInView.passwordForgottenButton setFrame:CGRectMake(self.view.center.x - 125, 265.0f, 250.0f, 40.0f)];    }


//Finds to see if the user has an iPhone 5/5s, and then set's the layout if they do
else if (screenBounds.size.height == 568)
{
    [self.logInView.logInButton setFrame:CGRectMake(self.view.center.x - 125,360.0f, 250.0f, 50.0f)];
    [self.logInView.usernameField setFrame:CGRectMake(self.view.center.x - 125, 245.0f, 250.0f, 50.0f)];
    [self.logInView.passwordField setFrame:CGRectMake(self.view.center.x - 125, 295.0f, 250.0f, 50.0f)];
    [self.logInView.passwordForgottenButton setFrame:CGRectMake(self.view.center.x - 125, 445.0f, 250.0f, 40.0f)];    }

//If the user doesn't have a 4S/5/5s, then they must be using an iPhone 6/6+
else {

        [self.logInView.logInButton setFrame:CGRectMake(self.view.center.x - 125, 420.0f, 250.0f, 50.0f)];
        [self.logInView.usernameField setFrame:CGRectMake(self.view.center.x - 125, 275.0f, 250.0f, 50.0f)];
        [self.logInView.passwordField setFrame:CGRectMake(self.view.center.x - 125, 325.0f, 250.0f, 50.0f)];
        [self.logInView.passwordForgottenButton setFrame:CGRectMake(self.view.center.x - 125, 485.0f, 250.0f, 40.0f)];

//Prints out the current device being used
    NSLog(@"Current device: %@", [[UIDevice currentDevice] model] );
}

iOS 以编程方式居中对象

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