iOS之加载等待指示器（工具类）

#import "CXDView.h"

@interface CXDView ()

//动态图
@property (strong, nonatomic) UIImageView *loadingImageView;
//提示文字
@property (strong, nonatomic) UILabel *toastLabel;

@end

@implementation CXDView

#pragma mark - 初始化
- (instancetype)init
{
self = [super init];
if (self) {
[self addSubview:self.loadingImageView];
[self addSubview:self.toastLabel];
}
return self;
}

#pragma mark - 接口方法
//要把loading界面加载到哪个界面上
+ (void)showCXDViewFromSuperView:(UIView *)superView
{
[self showCXDViewFromSuperView:superView offsetY:0];
}

//要把loading界面从哪个界面上移除
+ (void)removeCXDViewFromSuperView:(UIView *)superView
{
//在父视图的【所有子视图数组】当中查找
for (UIView *itemView in superView.subviews) {
//如果某个子视图是CXDView类型
if ([itemView isKindOfClass:[CXDView class]]) {
//将它从父视图中移除
[itemView removeFromSuperview];
}
}
}

//要把loading界面加载到哪个界面上（具体位置多少）
+ (void)showCXDViewFromSuperView:(UIView *)superView offsetY:(CGFloat)offsetY
{
CXDView *loadingView = [[CXDView alloc] init];
loadingView.frame = CGRectMake([UIScreen mainScreen].bounds.size.width/2-40, [UIScreen mainScreen].bounds.size.height/2-40+offsetY, 80, 60);
//  PS:由于imageView和label不可操作，且自定义View背景为透明,所以无影响
//  pss:如果控件可操作，超出view范围，则不可以继续操作

//判断superView上是否已经存在一个CXDView
//如果已经存在,那么先删除这个CXDView
[self removeCXDViewFromSuperView:superView];
//再加载新的View
[superView addSubview:loadingView];
//让动态图动起来
[loadingView.loadingImageView startAnimating];

}

#pragma mark - 懒加载
-(UIImageView *)loadingImageView
{
if (!_loadingImageView) {
_loadingImageView = [[UIImageView alloc] init];
_loadingImageView.frame = CGRectMake(0, 0, 80, 80);
_loadingImageView.backgroundColor = [UIColor clearColor];
//设置动态图属性
_loadingImageView.animationImages = [self getImageArray];
_loadingImageView.animationDuration = 2.0;
_loadingImageView.animationRepeatCount = 0;
}
return _loadingImageView;
}

//获取图片数组
- (NSArray *)getImageArray
{
//获取图片名称
NSMutableArray *imageNameArr = [NSMutableArray array];
for (int i = 1; i < 16; i++) {
NSString *imageName;
if (i<10) {
imageName = [NSString stringWithFormat:@"loading_animate_0%d",i];
}else{
imageName = [NSString stringWithFormat:@"loading_animate_%d",i];
}
[imageNameArr addObject:imageName];
}
//获取图片数组
NSMutableArray *imageArr = [NSMutableArray array];
for (int i = 0; i < 15; i++) {
NSString *imageName = [imageNameArr objectAtIndex:i];
UIImage *image = [UIImage imageNamed:imageName];
[imageArr addObject:image];
}

return imageArr;
}

-(UILabel *)toastLabel
{
if (!_toastLabel) {
_toastLabel = [[UILabel alloc] init];
_toastLabel.frame = CGRectMake(0, 90, 80, 30);
_toastLabel.text = @"片刻即来...";
_toastLabel.textColor = [UIColor darkGrayColor];
_toastLabel.font = [UIFont systemFontOfSize:14];
_toastLabel.textAlignment = NSTextAlignmentCenter;
}
return _toastLabel;
}

@end