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[操作系统]iOS关于启动页自定义特殊处理


平常开发中对于启动页可能会有一些特别的要求,比如在启动页加动画或加一些按键可以响应事件等,最近项目中要在启动页增加版本号,因为版本号是不断的改变,所以要动态实现把它加到启动页上;在XCode上面配置的Launch Images Source或Launch Screen FIle(IOS8以上会优先调用这个作为启动项)都是保存一张静态图片;

原理:

其实原理也是很简单,启动页还是运用Launch Images Source的内容,然后在做一个视图在最上层,视图的背景用启动项的那张图,让人误以为还在启动中,启动页加载完成后,就显示这层视图,在2秒后再把这层视图删除,产生一个过度的假启动页效果;而我们自定义的动作就可以在这层视图上进行;下面将通过Coding.net的APP讲解这个功能;

一:创建一个视图EaseStartView

EaseStartView.h文件内容:

#import <UIKit/UIKit.h>@interface EaseStartView : UIView+ (instancetype)startView;- (void)startAnimationWithCompletionBlock:(void(^)(EaseStartView *easeStartView))completionHandler;@end

EaseStartView.m文件内容:

#import "EaseStartView.h"#import <NYXImagesKit/NYXImagesKit.h>#import "StartImagesManager.h"@interface EaseStartView ()@property (strong, nonatomic) UIImageView *bgImageView, *logoIconView;@property (strong, nonatomic) UILabel *descriptionStrLabel;@end@implementation EaseStartView+ (instancetype)startView{  UIImage *logoIcon = [UIImage imageNamed:@"logo_coding_top"];  StartImage *st = [[StartImagesManager shareManager] randomImage];  return [[self alloc] initWithBgImage:st.image logoIcon:logoIcon descriptionStr:st.descriptionStr];}- (instancetype)initWithBgImage:(UIImage *)bgImage logoIcon:(UIImage *)logoIcon descriptionStr:(NSString *)descriptionStr{  self = [super initWithFrame:kScreen_Bounds];  if (self) {    //add custom code    UIColor *blackColor = [UIColor blackColor];    self.backgroundColor = blackColor;        _bgImageView = [[UIImageView alloc] initWithFrame:kScreen_Bounds];    _bgImageView.contentMode = UIViewContentModeScaleAspectFill;    _bgImageView.alpha = 0.0;    [self addSubview:_bgImageView];        [self addGradientLayerWithColors:@[(id)[blackColor colorWithAlphaComponent:0.4].CGColor, (id)[blackColor colorWithAlphaComponent:0.0].CGColor] locations:nil startPoint:CGPointMake(0.5, 0.0) endPoint:CGPointMake(0.5, 0.4)];    _logoIconView = [[UIImageView alloc] init];    _logoIconView.contentMode = UIViewContentModeScaleAspectFit;    [self addSubview:_logoIconView];    _descriptionStrLabel = [[UILabel alloc] init];    _descriptionStrLabel.font = [UIFont systemFontOfSize:10];    _descriptionStrLabel.textColor = [UIColor colorWithWhite:1.0 alpha:0.5];    _descriptionStrLabel.textAlignment = NSTextAlignmentCenter;    _descriptionStrLabel.alpha = 0.0;    [self addSubview:_descriptionStrLabel];        [_descriptionStrLabel mas_makeConstraints:^(MASConstraintMaker *make) {      make.centerX.equalTo(@[self, _logoIconView]);      make.height.mas_equalTo(10);      make.bottom.equalTo(self.mas_bottom).offset(-15);      make.left.equalTo(self.mas_left).offset(20);      make.right.equalTo(self.mas_right).offset(-20);    }];    [_logoIconView mas_makeConstraints:^(MASConstraintMaker *make) {      make.centerX.equalTo(self);      make.top.mas_equalTo(kScreen_Height/7);      make.width.mas_equalTo(kScreen_Width *2/3);      make.height.mas_equalTo(kScreen_Width/4 *2/3);    }];        [self configWithBgImage:bgImage logoIcon:logoIcon descriptionStr:descriptionStr];  }  return self;}- (void)configWithBgImage:(UIImage *)bgImage logoIcon:(UIImage *)logoIcon descriptionStr:(NSString *)descriptionStr{  bgImage = [bgImage scaleToSize:[_bgImageView doubleSizeOfFrame] usingMode:NYXResizeModeAspectFill];  self.bgImageView.image = bgImage;  self.logoIconView.image = logoIcon;  self.descriptionStrLabel.text = descriptionStr;  [self updateConstraintsIfNeeded];}- (void)startAnimationWithCompletionBlock:(void(^)(EaseStartView *easeStartView))completionHandler{  [[UIApplication sharedApplication].keyWindow addSubview:self];  [[UIApplication sharedApplication].keyWindow bringSubviewToFront:self];  _bgImageView.alpha = 0.0;  _descriptionStrLabel.alpha = 0.0;  @weakify(self);  [UIView animateWithDuration:2.0 animations:^{    @strongify(self);    self.bgImageView.alpha = 1.0;    self.descriptionStrLabel.alpha = 1.0;  } completion:^(BOOL finished) {    [UIView animateWithDuration:0.6 delay:0.3 options:UIViewAnimationOptionCurveEaseIn animations:^{      @strongify(self);      [self setX:-kScreen_Width];    } completion:^(BOOL finished) {      @strongify(self);      [self removeFromSuperview];      if (completionHandler) {        completionHandler(self);      }    }];  }];}@end

其实本实例中最为关键的内容在方法startAnimationWithCompletionBlock里

  [[UIApplication sharedApplication].keyWindow addSubview:self];  [[UIApplication sharedApplication].keyWindow bringSubviewToFront:self];

代码就是把这个视图设置成在最前的最上层,这样就可以盖住程序中的页面;

  _bgImageView.alpha = 0.0;  _descriptionStrLabel.alpha = 0.0;

这个是为了下面的动画做准备,若是直接用背景图可以把这两个都设置成0.99这样就不会有一闪的错觉;

  @weakify(self);  [UIView animateWithDuration:2.0 animations:^{    @strongify(self);    self.bgImageView.alpha = 1.0;    self.descriptionStrLabel.alpha = 1.0;  } completion:^(BOOL finished) {    [UIView animateWithDuration:0.6 delay:0.3 options:UIViewAnimationOptionCurveEaseIn animations:^{      @strongify(self);      [self setX:-kScreen_Width];    } completion:^(BOOL finished) {      @strongify(self);      [self removeFromSuperview];      if (completionHandler) {        completionHandler(self);      }    }];  }];

这边是动画效果,时间设置为2秒,因为这边第一个动画完还有一个缩放的效果;当动画结束后就可以  [self removeFromSuperview];

二:调用启动页视图

在AppDelegate中的didFinishLaunchingWithOptions进行调用;

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{  self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];  // Override point for customization after application launch.  self.window.backgroundColor = [UIColor whiteColor];    //网络  [[AFNetworkActivityIndicatorManager sharedManager] setEnabled:YES];  [[AFNetworkReachabilityManager sharedManager] startMonitoring];    //设置导航条样式  [self customizeInterface];  [[UIApplication sharedApplication] setStatusBarHidden:NO withAnimation:UIStatusBarAnimationFade];  if ([Login isLogin]) {    [self setupTabViewController];  }else{    [UIApplication sharedApplication].applicationIconBadgeNumber = 0;    [self setupIntroductionViewController];  }  [self.window makeKeyAndVisible];  [FunctionIntroManager showIntroPage];  EaseStartView *startView = [EaseStartView startView];  @weakify(self);  [startView startAnimationWithCompletionBlock:^(EaseStartView *easeStartView) {    @strongify(self);    //可以做其它事情  }];    return YES;}

注意,EaseStartView代码的位置是要放在最后面,因为要让它盖在最上层,就要后面加载,这样就可以盖在登录页面上面或者主页上;到这就已经可以成功启动页的效果;

三:下面实例为项目中用到的动态加载版本号到启动页上

#import "StartUpView.h"@interface StartUpView()@property (strong, nonatomic) UIImageView *bgImageView;@property (strong, nonatomic) UILabel *descriptionStrLabel;@end@implementation StartUpView+ (instancetype)startView{  UIImage *bgImage=kshamLaunchImage;  return [[self alloc] initWithBgImage:bgImage];}- (instancetype)initWithBgImage:(UIImage *)bgImage{  self = [super initWithFrame:Main_Screen_Bounds];  if (self) {        _bgImageView = [[UIImageView alloc] initWithFrame:Main_Screen_Bounds];    _bgImageView.contentMode = UIViewContentModeScaleAspectFill;    _bgImageView.alpha = 0;    _bgImageView.image=bgImage;    [self addSubview:_bgImageView];        _descriptionStrLabel = [[UILabel alloc] init];    _descriptionStrLabel.font = [UIFont systemFontOfSize:15];    _descriptionStrLabel.textColor = [UIColor blackColor];    _descriptionStrLabel.textAlignment = NSTextAlignmentCenter;    _descriptionStrLabel.alpha = 0;    _descriptionStrLabel.text=[NSString stringWithFormat:@"版本号为:%@",appVersion];    [self addSubview:_descriptionStrLabel];        [_descriptionStrLabel mas_makeConstraints:^(MASConstraintMaker *make) {      make.height.mas_equalTo(50);      make.bottom.equalTo(self.mas_bottom).offset(-15);      make.left.equalTo(self.mas_left).offset(20);      make.right.equalTo(self.mas_right).offset(-20);    }];  }  return self;}- (void)startAnimationWithCompletionBlock:(void(^)(StartUpView *easeStartView))completionHandler{  [[UIApplication sharedApplication].keyWindow addSubview:self];  [[UIApplication sharedApplication].keyWindow bringSubviewToFront:self];  _bgImageView.alpha = 0.99;  _descriptionStrLabel.alpha = 0.99;    @weakify(self);  [UIView animateWithDuration:2.0 animations:^{    @strongify(self);    self.bgImageView.alpha = 1.0;    self.descriptionStrLabel.alpha = 1.0;  } completion:^(BOOL finished) {    [self removeFromSuperview];    if (completionHandler) {      completionHandler(self);    }  }];}@end