iOS UIActivityIndicatorView用法（小菊花旋轉(zhuǎn)）
UIActivityIndicatorView初始化方式
- -(instancetype)initWithActivityIndicatorStyle:(UIActivityIndicatorViewStyle)style
- -(instancetype)initWithFrame:(CGRect)frame
其中的第一個(gè)初始化方法參數(shù)style是個(gè)枚舉類型庵朝。
typedef NS_ENUM(NSInteger, UIActivityIndicatorViewStyle) {
UIActivityIndicatorViewStyleWhiteLarge,
UIActivityIndicatorViewStyleWhite,
UIActivityIndicatorViewStyleGray,
};
B200AA69-65CD-46D1-B2CE-878CAED5E1B3.png
代碼示例
這是我在Main.storyboard拖拽的兩個(gè)按鈕饰躲，是為了控制開始旋轉(zhuǎn)和停止旋轉(zhuǎn)娜搂，也可以自己手寫代碼呦
59C9330B-B51C-408D-BB1F-F8DA448C6595.png
#import "ViewController.h"
@interface ViewController ()
- (IBAction)startAction:(UIButton *)sender;
- (IBAction)stopAction:(UIButton *)sender;
@property (strong, nonatomic) UIActivityIndicatorView *activityIndicator ;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// self.activityIndicator = [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(100, 100, 60, 60)];
self.activityIndicator = [[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle:(UIActivityIndicatorViewStyleGray)];
[self.view addSubview:self.activityIndicator];
//屬性值是一個(gè)枚舉變量，只有三個(gè)值：
//UIActivityIndicatorViewStyleWhite; 白色圓圈
//UIActivityIndicatorViewStyleWhiteLarge; 白色圓圈 但是要大些
//UIActivityIndicatorViewStyleGray; 灰色圓圈
// self.activityIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyleWhiteLarge;
self.activityIndicator.frame= CGRectMake(100, 100, 100, 100);
//設(shè)置小菊花顏色
self.activityIndicator.color = [UIColor redColor];
//設(shè)置背景顏色
self.activityIndicator.backgroundColor = [UIColor cyanColor];
//剛進(jìn)入這個(gè)界面會(huì)顯示控件。并且停止旋轉(zhuǎn)也會(huì)顯示风范，只是沒有在轉(zhuǎn)動(dòng)而已。
self.activityIndicator.hidesWhenStopped = NO;
}
- (IBAction)startAction:(UIButton *)sender {
[self.activityIndicator startAnimating];
}
- (IBAction)stopAction:(UIButton *)sender {
[self.activityIndicator stopAnimating];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
這是效果圖
-
控件中菊花大小是不變的沪么。只是設(shè)置控件的大小硼婿。
B23EF443-5891-4A10-B328-AB3276193A9D.png
