自定义Loading动画

自定义loading

.h文件中有两个类方法，显示以及移除

#import <UIKit/UIKit.h>

NS_ASSUME_NONNULL_BEGIN

@interface LCSLoading : UIView

+ (void)showInView:(UIView *)parentView;

+ (void)dismissFromView:(UIView *)parentView;

@end

NS_ASSUME_NONNULL_END

.m里是方法的实现

@implementation LCSLoading

+ (void)showInView:(UIView *)parentView {
    
    
    CGFloat parentWidth = parentView.frame.size.width;
    CGFloat parentHeight = parentView.frame.size.height;
        
    //防止多个loading叠加在一起
    for (LCSLoading *view in parentView.subviews) {
    
        if([view isMemberOfClass:[LCSLoading class]]) return;
    }
    
    //创建hud
    LCSLoading *hudView = [[LCSLoading alloc] initWithFrame:CGRectMake(0, 0, parentWidth, parentHeight)];
    [hudView setBackgroundColor:[[UIColor whiteColor] colorWithAlphaComponent:0.1]];
    [parentView addSubview:hudView];
    
    //添加旋转图片背景
    CGFloat contentWidth = 80, contentHeight = 80;
    UIView *contentView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, contentWidth, contentHeight)];
    [contentView setBackgroundColor:[UIColor colorWithWhite:0.2 alpha:0.8]];
    contentView.center = CGPointMake(parentWidth/2, parentHeight/2);
    contentView.layer.cornerRadius = 10;
    [hudView addSubview:contentView];
    
    //添加旋转图片
    UIImageView *loadingImageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 45, 45)];
    loadingImageView.center = CGPointMake(contentView.frame.size.width/2, contentView.frame.size.height/2);
    loadingImageView.image = [UIImage imageNamed:@"punch_loading"];
    [contentView addSubview:loadingImageView];
    
    //添加旋转动画
    CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"transform"];
    animation.fromValue = [NSValue valueWithCATransform3D:CATransform3DMakeRotation(M_PI, 0.0, 0.0, 1.0)];
    animation.toValue = [NSValue valueWithCATransform3D:CATransform3DIdentity];
    animation.duration = 1;
    animation.cumulative = YES;
    animation.repeatCount = MAXFLOAT;
    
    //在图片边缘添加透明区域，去掉图片锯齿
    CGRect imageRect = CGRectMake(0, 0, loadingImageView.frame.size.width, loadingImageView.frame.size.height);
    UIGraphicsBeginImageContext(imageRect.size);
    [loadingImageView.image drawInRect:CGRectMake(1, 1, loadingImageView.frame.size.width-2, loadingImageView.frame.size.height-2)];
    loadingImageView.image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    //给图片添加动画
    [loadingImageView.layer addAnimation:animation forKey:nil];
    
}

+ (void)dismissFromView:(UIView *)parentView {
    

    for (LCSLoading *view in parentView.subviews) {
    
        if([view isMemberOfClass:[LCSLoading class]]) {
    
            [UIView animateWithDuration:0.5 animations:^{
    
                view.alpha = 0.01;
            } completion:^(BOOL finished) {
    
                [view removeFromSuperview];
            }];
        }
    }
}


/* // Only override drawRect: if you perform custom drawing. // An empty implementation adversely affects performance during animation. - (void)drawRect:(CGRect)rect { // Drawing code } */

@end

接下来是具体调用，显示后5s移除

[LCSLoading showInView:self.view];
    
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(5 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
    
        [LCSLoading dismissFromView:self.view];
    });