LGLProgressHUD

不想用第三方的指示器，感觉有点大，自己写了一个简单的活动指示器，目前只有两种效果。效果如图

第一种：

第二种

第二种可以随着提示文字的增多而变长

LGLProgressHUD.h

//
//  LGLProgressHUD.h
//  LGLProgress
//
//  Created by 李国良 on 2016/10/8.
//  Copyright © 2016年 李国良. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface LGLProgressHUD : NSObject

+ (instancetype)shareProgressHUD;

- (void)showProgress;
- (void)showProgressWithMessage:(NSString *)message;
- (void)stopProgress;
@end

LGLProgressHUD.m

//
//  LGLProgressHUD.m
//  LGLProgress
//
//  Created by 李国良 on 2016/10/8.
//  Copyright © 2016年 李国良. All rights reserved.
/*  菊花样式的修改
 typedef NS_ENUM(NSInteger, UIActivityIndicatorViewStyle) {
 UIActivityIndicatorViewStyleWhiteLarge,
 UIActivityIndicatorViewStyleWhite,
 UIActivityIndicatorViewStyleGray,
 };
 
 */

#import "LGLProgressHUD.h"

#define WIDTH [UIScreen mainScreen].bounds.size.width
#define HEIGHT [UIScreen mainScreen].bounds.size.height
#define BACKGROUNDCOLOR [UIColor colorWithRed:0 green:0 blue:0 alpha:0.3]
#define TEXTFONT(a)  [UIFont systemFontOfSize:a]

@interface LGLProgressHUD ()

{
    UIView * _alertView;
    UIActivityIndicatorView * _activity;
    UILabel * _alertText;
}

@end

@implementation LGLProgressHUD

static id _instace;

+ (instancetype)shareProgressHUD
{
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{// 只创建一次
        _instace = [[self alloc] init];
    });
    return _instace;
}

+ (id)allocWithZone:(struct _NSZone *)zone
{
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{// 只初始化一次
        _instace = [super allocWithZone:zone];
    });
    return _instace;
}

- (id)copyWithZone:(NSZone *)zone
{
    return _instace;
}


- (void)showProgress {
   
    if (!_alertView) {
         UIWindow *window = [UIApplication sharedApplication].keyWindow;
        _alertView = [[UIView alloc] initWithFrame:CGRectMake(WIDTH / 2 - 50, HEIGHT / 2 - 50, 110, 110)];
        _alertView.backgroundColor = BACKGROUNDCOLOR;
        _alertView.layer.masksToBounds = YES;
        _alertView.layer.cornerRadius = 10;
        
        _activity = [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(0, 0, 110, 80)];
        [_activity setActivityIndicatorViewStyle:UIActivityIndicatorViewStyleWhiteLarge];
        [_alertView addSubview:_activity];
        
        _alertText = [[UILabel alloc] initWithFrame:CGRectMake(0, 80, 110, 20)];
        _alertText.text = @"正在加载...";
        _alertText.textAlignment = NSTextAlignmentCenter;
        _alertText.textColor = [UIColor whiteColor];
        _alertText.font = TEXTFONT(14);
        [_alertView addSubview:_alertText];
        [_activity startAnimating];
        [window addSubview:_alertView];
    }
}

- (void)showProgressWithMessage:(NSString *)message {
    if (!_alertView) {
        _alertView = [[UIView alloc] init];
        _alertView.backgroundColor = BACKGROUNDCOLOR;
        _alertView.layer.masksToBounds = YES;
        _alertView.layer.cornerRadius = 8;
        CGSize textSize = [self sizeWithText:message font:TEXTFONT(14) maxW:0];
        _alertText = [[UILabel alloc] initWithFrame:CGRectMake(10, 10, textSize.width, textSize.height)];
        _alertText.font = TEXTFONT(14);
        _alertText.textColor = [UIColor whiteColor];
        _alertText.textAlignment = NSTextAlignmentCenter;
        _alertText.text = message;
        [_alertView addSubview:_alertText];
        _alertView.frame = CGRectMake(MAX(WIDTH / 2 - (CGRectGetMaxX(_alertText.frame) + 10) / 2, WIDTH / 2 - (WIDTH - 20) / 2), HEIGHT / 2 - (textSize.height + 20) / 2, MIN(CGRectGetMaxX(_alertText.frame) + 10, WIDTH - 20),textSize.height + 20);
        UIWindow * window = [UIApplication sharedApplication].keyWindow;
        [window addSubview:_alertView];
        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.7 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
            [self stopProgress];
        });
    }
}

- (void)stopProgress {
    [_activity stopAnimating];
    [_alertView removeFromSuperview];
    _alertView = nil;
}

//计算文字的大小 maxW限制最大宽度 maxW 传MAXFLOAT，没有限制最大的宽度
- (CGSize)sizeWithText:(NSString *)text font:(UIFont *)font maxW:(CGFloat)maxW
{
    NSMutableDictionary *attrs = [NSMutableDictionary dictionary];
    attrs[NSFontAttributeName] = font;
    CGSize maxSize = CGSizeMake(maxW, MAXFLOAT);
    
    return [text boundingRectWithSize:maxSize options:NSStringDrawingUsesLineFragmentOrigin attributes:attrs context:nil].size;
}

@end