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UIView生命周期详解

UIView生命周期详解

作者: Don_He | 来源:发表于2019-04-12 16:14 被阅读0次

    UIView生命周期详解

    View代码实现

    • 一般情况
    MyView *myView = [[MyView alloc] init];
[self.view addSubview:myView];

    // 初始化过程
2019-04-12 14:44:47.558747+0800 UIViewLifeDemo[12529:360679] Step 1 -- -[MyView initWithFrame:]
2019-04-12 14:44:47.558957+0800 UIViewLifeDemo[12529:360679] Step 2 -- -[MyView init]
2019-04-12 14:44:47.559035+0800 UIViewLifeDemo[12529:360679] Step 3 -- -[MyView willMoveToSuperview:]
2019-04-12 14:44:47.559131+0800 UIViewLifeDemo[12529:360679] Step 4 -- -[MyView didMoveToSuperview]
2019-04-12 14:44:47.569525+0800 UIViewLifeDemo[12529:360679] Step 5 -- -[MyView willMoveToWindow:]
2019-04-12 14:44:47.569683+0800 UIViewLifeDemo[12529:360679] Step 6 -- -[MyView didMoveToWindow]
2019-04-12 14:44:47.591882+0800 UIViewLifeDemo[12529:360679] Step 7 -- -[MyView layoutSubviews]

// 销毁过程
2019-04-12 14:44:56.431678+0800 UIViewLifeDemo[12529:360679] Step 8 -- -[MyView willMoveToWindow:]
2019-04-12 14:44:56.431824+0800 UIViewLifeDemo[12529:360679] Step 9 -- -[MyView didMoveToWindow]
2019-04-12 14:44:56.432235+0800 UIViewLifeDemo[12529:360679] Step 10 -- -[MyView removeFromSuperview]
2019-04-12 14:44:56.432473+0800 UIViewLifeDemo[12529:360679] Step 11 -- -[MyView dealloc]
    • 重复地移除再添加到相同的SuperView，willMoveToSuperview和didMoveToSuperview不会重复调用。
    MyView *myView = [[MyView alloc] init];
    
for (int n = 0; n < 4; n++) {
    [self.view addSubview:myView];
    [myView removeFromSuperview];
}

    // 初始化过程
2019-04-12 15:13:27.774165+0800 UIViewLifeDemo[14955:381550] Step 1 -- -[MyView initWithFrame:]
2019-04-12 15:13:27.774380+0800 UIViewLifeDemo[14955:381550] Step 2 -- -[MyView init]
2019-04-12 15:13:27.774450+0800 UIViewLifeDemo[14955:381550] Step 3 -- -[MyView willMoveToSuperview:]
2019-04-12 15:13:27.774539+0800 UIViewLifeDemo[14955:381550] Step 4 -- -[MyView didMoveToSuperview]
2019-04-12 15:13:27.774684+0800 UIViewLifeDemo[14955:381550] Step 5 -- -[MyView removeFromSuperview]
2019-04-12 15:13:27.774773+0800 UIViewLifeDemo[14955:381550] Step 6 -- -[MyView removeFromSuperview]
2019-04-12 15:13:27.774863+0800 UIViewLifeDemo[14955:381550] Step 7 -- -[MyView removeFromSuperview]
2019-04-12 15:13:27.774951+0800 UIViewLifeDemo[14955:381550] Step 8 -- -[MyView removeFromSuperview]
2019-04-12 15:13:27.782601+0800 UIViewLifeDemo[14955:381550] Step 9 -- -[MyView willMoveToWindow:]
2019-04-12 15:13:27.782798+0800 UIViewLifeDemo[14955:381550] Step 10 -- -[MyView didMoveToWindow]
2019-04-12 15:13:27.797559+0800 UIViewLifeDemo[14955:381550] Step 11 -- -[MyView layoutSubviews]
    • 重复地移除再添加到不同的SuperView，willMoveToSuperview和didMoveToSuperview会重复调用。
    MyView *myView = [[MyView alloc] init];
    
UIView *view0 = [[UIView alloc] init];
UIView *view1 = [[UIView alloc] init];
    
for (int n = 0; n < 4; n++) {
    if (n % 2 == 0) {
        [view0 addSubview:myView];
    }
    else {
        [view1 addSubview:myView];
    }
    
    [myView removeFromSuperview];
}
    
[self.view addSubview:myView];

    // 初始化过程
2019-04-12 15:21:07.953595+0800 UIViewLifeDemo[15040:386253] Step 1 -- -[MyView initWithFrame:]
2019-04-12 15:21:07.953780+0800 UIViewLifeDemo[15040:386253] Step 2 -- -[MyView init]
2019-04-12 15:21:07.953927+0800 UIViewLifeDemo[15040:386253] Step 3 -- -[MyView willMoveToSuperview:]
2019-04-12 15:21:07.954039+0800 UIViewLifeDemo[15040:386253] Step 4 -- -[MyView didMoveToSuperview]
2019-04-12 15:21:07.954126+0800 UIViewLifeDemo[15040:386253] Step 5 -- -[MyView removeFromSuperview]
2019-04-12 15:21:07.954193+0800 UIViewLifeDemo[15040:386253] Step 6 -- -[MyView willMoveToSuperview:]
2019-04-12 15:21:07.954276+0800 UIViewLifeDemo[15040:386253] Step 7 -- -[MyView didMoveToSuperview]
2019-04-12 15:21:07.954390+0800 UIViewLifeDemo[15040:386253] Step 8 -- -[MyView removeFromSuperview]
2019-04-12 15:21:07.954629+0800 UIViewLifeDemo[15040:386253] Step 9 -- -[MyView willMoveToSuperview:]
2019-04-12 15:21:07.954850+0800 UIViewLifeDemo[15040:386253] Step 10 -- -[MyView didMoveToSuperview]
2019-04-12 15:21:07.955045+0800 UIViewLifeDemo[15040:386253] Step 11 -- -[MyView removeFromSuperview]
2019-04-12 15:21:07.955218+0800 UIViewLifeDemo[15040:386253] Step 12 -- -[MyView willMoveToSuperview:]
2019-04-12 15:21:07.955427+0800 UIViewLifeDemo[15040:386253] Step 13 -- -[MyView didMoveToSuperview]
2019-04-12 15:21:07.955629+0800 UIViewLifeDemo[15040:386253] Step 14 -- -[MyView removeFromSuperview]
2019-04-12 15:21:07.955832+0800 UIViewLifeDemo[15040:386253] Step 15 -- -[MyView willMoveToSuperview:]
2019-04-12 15:21:07.956073+0800 UIViewLifeDemo[15040:386253] Step 16 -- -[MyView didMoveToSuperview]
2019-04-12 15:21:07.980502+0800 UIViewLifeDemo[15040:386253] Step 17 -- -[MyView willMoveToWindow:]
2019-04-12 15:21:07.980657+0800 UIViewLifeDemo[15040:386253] Step 18 -- -[MyView didMoveToWindow]
2019-04-12 15:21:07.994333+0800 UIViewLifeDemo[15040:386253] Step 19 -- -[MyView layoutSubviews]

    View xib实现

    • 一般情况
    // 初始化过程
2019-04-12 15:24:56.344593+0800 UIViewLifeDemo[15131:389556] Step 1 -- -[MyView initWithCoder:]
2019-04-12 15:24:56.344728+0800 UIViewLifeDemo[15131:389556] Step 2 -- -[MyView willMoveToSuperview:]
2019-04-12 15:24:56.344828+0800 UIViewLifeDemo[15131:389556] Step 3 -- -[MyView didMoveToSuperview]
2019-04-12 15:24:56.351139+0800 UIViewLifeDemo[15131:389556] Step 4 -- -[MyView willMoveToWindow:]
2019-04-12 15:24:56.351460+0800 UIViewLifeDemo[15131:389556] Step 5 -- -[MyView didMoveToWindow]
2019-04-12 15:24:56.364634+0800 UIViewLifeDemo[15131:389556] Step 6 -- -[MyView layoutSubviews]

// 销毁过程
2019-04-12 15:25:19.571373+0800 UIViewLifeDemo[15131:389556] Step 7 -- -[MyView willMoveToWindow:]
2019-04-12 15:25:19.571539+0800 UIViewLifeDemo[15131:389556] Step 8 -- -[MyView didMoveToWindow]
2019-04-12 15:25:19.572150+0800 UIViewLifeDemo[15131:389556] Step 9 -- -[MyView removeFromSuperview]
2019-04-12 15:25:19.572476+0800 UIViewLifeDemo[15131:389556] Step 10 -- -[MyView dealloc]
    • 在xib中修改View的属性，initWithCoder方法中就会生效

    xib中的MyView修改了背景颜色，从日志可以看到背景颜色从-[MyView initWithCoder:]开始已经修改为#007affff。

    2019-04-12 15:54:48.920910+0800 UIViewLifeDemo[15547:409869] Step 1 -- -[MyView initWithCoder:] -- backgroundColor #007affff
2019-04-12 15:54:48.921155+0800 UIViewLifeDemo[15547:409869] Step 2 -- -[MyView willMoveToSuperview:] -- backgroundColor #007affff
2019-04-12 15:54:48.921288+0800 UIViewLifeDemo[15547:409869] Step 3 -- -[MyView didMoveToSuperview] -- backgroundColor #007affff
2019-04-12 15:54:48.929106+0800 UIViewLifeDemo[15547:409869] Step 4 -- -[MyView willMoveToWindow:] -- backgroundColor #007affff
2019-04-12 15:54:48.929429+0800 UIViewLifeDemo[15547:409869] Step 5 -- -[MyView didMoveToWindow] -- backgroundColor #007affff
2019-04-12 15:54:48.941557+0800 UIViewLifeDemo[15547:409869] Step 6 -- -[MyView layoutSubviews] -- backgroundColor #007affff
    • 在Category中为View添加属性，并在xib中修改该属性，didMoveToSuperview方法执行后才会生效

    在Category中为MyView添加myText属性

    // MyView+Extension.h

IB_DESIGNABLE

@interface MyView (Extension)

@property(nonatomic, strong) IBInspectable NSString *myText;

@end



// MyView+Extension.m

@implementation MyView (Extension)

- (void)setMyText:(NSString *)myText {
    objc_setAssociatedObject(self, (__bridge const void * _Nonnull)(self), myText, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}

- (NSString *)myText {
    NSString *myText = objc_getAssociatedObject(self, (__bridge const void * _Nonnull)(self));
    return myText;
}

@end

    在xib中设置myText的值, -[MyView didMoveToSuperview]执行完后才会生效

    MyText.png 
    2019-04-12 15:59:48.380369+0800 UIViewLifeDemo[15605:413050] Step 1 -- -[MyView initWithCoder:] -- myText (null)
2019-04-12 15:59:48.380536+0800 UIViewLifeDemo[15605:413050] Step 2 -- -[MyView willMoveToSuperview:] -- myText (null)
2019-04-12 15:59:48.380626+0800 UIViewLifeDemo[15605:413050] Step 3 -- -[MyView didMoveToSuperview] -- myText (null)
2019-04-12 15:59:52.558483+0800 UIViewLifeDemo[15605:413050] Step 4 -- -[MyView willMoveToWindow:] -- myText Hello world
2019-04-12 15:59:52.558827+0800 UIViewLifeDemo[15605:413050] Step 5 -- -[MyView didMoveToWindow] -- myText Hello world
2019-04-12 15:59:52.574201+0800 UIViewLifeDemo[15605:413050] Step 6 -- -[MyView layoutSubviews] -- myText Hello world

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