ios开发代码笔记

原创于 2013-08-03 14:41:05 发布 · 808 阅读

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本文介绍了如何在iOS应用中创建并定制UI元素，包括设置view背景颜色、创建不同类型的UIButton（含字体与背景图片、仅背景图片）、创建UILabel以及为navigationItem添加自定义视图如按钮和标题。

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一，设置view的背景颜色

self.view.backgroundColor = [UIColor blackColor];

二，创建UIButton

1 有字体有背景图片的button

UIButton *myButton = [UIButton buttonWithType:UIButtonTypeCustom];
myButton.contentMode = UIViewContentModeScaleAspectFit;
myButton.frame = CGRectMake(0, 0, 70, 40);
myButton.titleLabel.font = [UIFont fontWithName:@"Helvetica-Bold" size:14.0];
[myButton setTitle:@"点击" forState:UIControlStateNormal];
[myButton addTarget:self action:@selector(pressRefuseButton:) forControlEvents:UIControlEventTouchUpInside];
[myButton setBackgroundImage:[UIImage imageNamed:@"toolbar_btn_bg_n"] forState:UIControlStateNormal];
[myButton setBackgroundImage:[UIImage imageNamed:@"toolbar_btn_bg_d"] forState:UIControlStateSelected];

2 只有背景图片button

IButton *myButton2 = [UIButton buttonWithType:UIButtonTypeCustom];
myButton2.contentMode = UIViewContentModeScaleAspectFit;
myButton.frame = CGRectMake(0, 0, 44, 44);

[myButton2 setImage:[UIImage imageNamed:@"toolbar_refresh_icon_n"] forState:UIControlStateNormal];
[myButton2 addTarget:self action:@selector(refresh:) forControlEvents:UIControlEventTouchUpInside];

三创建Label

UILabel *titleLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 160, 22)];
titleLabel.font = [UIFont fontWithName:@"Helvetica-Bold" size:15.0];
titleLabel.textColor = [UIColor whiteColor];
titleLabel.backgroundColor = [UIColor clearColor];
titleLabel.textAlignment = UIBaselineAdjustmentAlignCenters;

四要为navigationItem增加自定义视图按钮和标题

UIBarButtonItem *leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:self.myButton];
UIBarButtonItem *leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:self.myButton2];
self.navigationItem.leftBarButtonItem = backButtonItem;
self.navigationItem.rightBarButtonItem = refreshButtonItem;
self.navigationItem.titleView = titleLabel;