//
// ViewController.m
// UI2_视图切换
//
// Created by zhangxueming on 15/7/1.
// Copyright (c) 2015年 zhangxueming. All rights reserved.
//
#import "ViewController.h"
@interface ViewController ()
{
NSInteger _tagIndex;//记录当前显示的视图
}
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
UILabel *redLabel = [[UILabel alloc] initWithFrame:CGRectMake(10, 100, 320, 100)];
redLabel.backgroundColor = [UIColor redColor];
redLabel.tag = 1;
redLabel.text = @"红色";
redLabel.textAlignment = NSTextAlignmentCenter ;
[self.view addSubview:redLabel];
UILabel *blueLabel = [[UILabel alloc] initWithFrame:CGRectMake(20, 120, 320, 100)];
blueLabel.backgroundColor = [UIColor blueColor];
blueLabel.tag = 2;
blueLabel.text = @"蓝色";
blueLabel.textAlignment = NSTextAlignmentCenter ;
[self.view addSubview:blueLabel];
UILabel *greenLabel = [[UILabel alloc] initWithFrame:CGRectMake(30, 140, 320, 100)];
greenLabel.backgroundColor = [UIColor greenColor];
greenLabel.tag = 3;
greenLabel.text = @"绿色";
greenLabel.textAlignment = NSTextAlignmentCenter ;
[self.view addSubview:greenLabel];
UIButton *lastBtn = [UIButton buttonWithType:UIButtonTypeSystem];
lastBtn.frame = CGRectMake(40, 400, 100, 30);
[lastBtn setTitle:@"上一张" forState:UIControlStateNormal];
lastBtn.backgroundColor = [UIColor cyanColor];
[lastBtn addTarget:self action:@selector(lastBtnClicked) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:lastBtn];
UIButton *nextBtn = [UIButton buttonWithType:UIButtonTypeSystem];
nextBtn.frame = CGRectMake(self.view.frame.size.width-140, 400, 100, 30);
[nextBtn setTitle:@"下一张" forState:UIControlStateNormal];
nextBtn.backgroundColor = [UIColor cyanColor];
[nextBtn addTarget:self action:@selector(nextBtnClicked) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:nextBtn];
//设置当前显示的视图
_tagIndex = 3;
self.view.backgroundColor = [UIColor blackColor];
}
- (void)lastBtnClicked
{
_tagIndex--;
if (_tagIndex<1) {
_tagIndex = 3;
}
//根据传入的tag值取出对应的视图
UILabel *label = (UILabel *)[self.view viewWithTag:_tagIndex];
[self.view bringSubviewToFront:label];
}
- (void)nextBtnClicked
{
_tagIndex++;
if (_tagIndex>3) {
_tagIndex = 1;
}
UILabel *label = (UILabel *)[self.view viewWithTag:_tagIndex];
[self.view bringSubviewToFront:label];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
转载于:https://www.cnblogs.com/0515offer/p/4638443.html
