iOS開發UI篇—九宮格座標計算知識點提取

#import "YYViewController.h"

@interface YYViewController ()
@property(nonatomic,strong)NSArray *apps;//聲明用strong
@end

@implementation YYViewController


//1.加載數據 懶加載方法
- (NSArray *)apps 
{
    if (!_apps) {
        //plist文件  將數據分離解耦合
        NSString *path=[[NSBundle mainBundle]pathForResource:@"app.plist" ofType:nil];
        _apps=[NSArray arrayWithContentsOfFile:path];
    }
    return _apps;
}

//2.完成佈局設計

    //三列
    int totalloc=3;
    CGFloat appvieww=80;
    CGFloat appviewh=90;

    CGFloat margin=(self.view.frame.size.width-totalloc*appvieww)/(totalloc+1);//算出邊距
    int count=self.apps.count;//將個數賦值
    for (int i=0; i<count; i++) {
        int row=i/totalloc;//行號
        //1/3=0,2/3=0,3/3=1;
        int loc=i%totalloc;//列號

        CGFloat appviewx=margin+(margin+appvieww)*loc;//動態獲取x座標
        CGFloat appviewy=margin+(margin+appviewh)*row;//動態獲取y座標
        ...
    }

-(void)click
{
    //動畫標籤
    UILabel *animalab=[[UILabel alloc]initWithFrame:CGRectMake(self.view.center.x-100, self.view.center.y+20, 200, 40)];
    [animalab setText:@"下載成功"];
    animalab.font=[UIFont systemFontOfSize:12.0];
    [animalab setBackgroundColor:[UIColor brownColor]];
    [animalab setAlpha:0];//設置其初始化狀態爲全透明
    [self.view addSubview:animalab];

//    [UIView beginAnimations:Nil context:Nil];  //從下面的內容開始將其加入動畫
//    [animalab setAlpha:1];    
//    [UIView setAnimationDuration:4.0];
//    [UIView commitAnimations];

    //執行完之後，還得把這給刪除了，推薦使用block動畫

    [UIView animateWithDuration:4.0 animations:^{
    [animalab setAlpha:1];
    } completion:^(BOOL finished) {
        //[self.view re];
    }];
}