(Ios practice) Implement toast controls similar to android

1. Implementation Principle

Create a custom control that displays text in the control and sets an animation. After three seconds, the alpha of the control is 0. After the animation is complete, the control is removed from the ViewControl.

 

2. Create a PopView

2.1 PopView. h

@interface PopView : UIView{    UILabel         *_textLabel;    int             _queueCount;}- (void) setText:(NSString *) text;@end

2.2 PopView. m

#import "PopView.h"#import <QuartzCore/QuartzCore.h>@implementation PopView- (id)initWithFrame:(CGRect)frame{    self = [super initWithFrame:frame];    if (self) {        self.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent: 0.75f];        self.layer.cornerRadius = 5.0f;        _textLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 100, 10)];        _textLabel.numberOfLines = 0;        _textLabel.font = [UIFont systemFontOfSize:17];        _textLabel.textColor = [UIColor whiteColor];        _textLabel.textAlignment = NSTextAlignmentCenter;        _textLabel.backgroundColor = [UIColor clearColor];        _textLabel.textAlignment = NSTextAlignmentCenter;        [self addSubview:_textLabel];        _queueCount = 0;    }    return self;}- (void) setText:(NSString *) text{    _textLabel.frame = CGRectMake(0, 0, 100, 10);    _queueCount ++;    self.alpha = 1.0f;    _textLabel.text = text;    [_textLabel sizeToFit];    CGRect frame = CGRectMake(5, 0, _textLabel.frame.size.width, _textLabel.frame.size.height);    _textLabel.frame = frame;   frame =  CGRectMake(self.frame.origin.x, self.frame.origin.y, _textLabel.frame.size.width+10, _textLabel.frame.size.height+10);    self.frame = frame;    [UIView animateWithDuration:3.0                          delay:0.0                        options:UIViewAnimationOptionCurveEaseIn                     animations:^{                         self.alpha = 0;                     }                     completion:^(BOOL finished){                         if (_queueCount == 1) {                             [self removeFromSuperview];                         }                        _queueCount--;                     }     ];    }@end

3. Call method:

[Self. view addSubview: _ popView]; [_ popView setText: @ "merging and recovery"];