1:iOS 使用NJKWebViewProgress做webview进度条
引入头文件:
#import "NJKWebViewProgressView.h"
#import "NJKWebViewProgress.h"
遵守协议
<UIWebViewDelegate, NJKWebViewProgressDelegate>
实现代码
@implementation ViewController
{
IBOutlet __weak UIWebView *_webView;
NJKWebViewProgressView *_webViewProgressView;
NJKWebViewProgress *_webViewProgress;
}
- (void)viewDidLoad
{
[super viewDidLoad];
_webViewProgress = [[NJKWebViewProgress alloc] init];
_webView.delegate = _webViewProgress;
_webViewProgress.webViewProxyDelegate = self;
_webViewProgress.progressDelegate = self;
CGRect navBounds = self.navigationController.navigationBar.bounds;
CGRect barFrame = CGRectMake(0,
navBounds.size.height - 2,
navBounds.size.width,
2);
_webViewProgressView = [[NJKWebViewProgressView alloc] initWithFrame:barFrame];
_webViewProgressView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleTopMargin;
[_webViewProgressView setProgress:0 animated:YES];
[self loadBaidu];
[self.navigationController.navigationBar addSubview:_webViewProgressView];
}
-(void)loadBidu
{
NSURLRequest *req = [[NSURLRequest alloc] initWithURL:[NSURL URLWithString:@"http://www.baidu.com/"]];
[_webView loadRequest:req];
}
#pragma mark - NJKWebViewProgressDelegate
-(void)webViewProgress:(NJKWebViewProgress *)webViewProgress updateProgress:(float)progress
{
[_webViewProgressView setProgress:progress animated:YES];
self.title = [_webView stringByeva luatingjava scriptFromString:@"document.title"];
}
2:解决输入框UITextField关于拼音或部首被当作内容响应
// 添加监听
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(textFieldDidChanged:)
name:UITextFieldTextDidChangeNotification
object:self.textField];
// 监听处理
- (void)textFieldDidChanged:(NSNotification *)notification {
NSString *text = self.textField.text;
// 拼音输入时,拼音字母处于选中状态,此时不判断是否超长
UITextRange *selectedRange = [self.textField markedTextRange];
if (!selectedRange || !selectedRange.start) {
if (text.length > MAXLENGTH) {
self.textField.text = [text substringToIndex:MAXLENGTH];
}
}
}
这里主要使用了两个知识:
- 输入法输入时,拼音字母或者笔画处于选中状态,可以使用 markedTextRange 获取到
- 普通输入,以及将输入法的待选字填入输入框时,都会发出 UITextFieldTextDidChangeNotification, 可以监听这个通知,并事后对 UITextField 的内容做清理
另外除了使用监听 NSNotification 的方式,也可以使用 addTargetAction 的方式,代码如下:
[self.textField addTarget:self
action:@selector(textChange:)
forControlEvents:UIControlEventEditingChanged];
这与上面的方式是等价的,但是使用 NSNotification 需要在对象销毁时 removeObserver,而这种方式不需要
3:根据内容自适应UIButton的大小
NSString *str = @"这是按钮的标题";
UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
btn.titleLabel.font = [UIFont systemFontOfSize:13.0];
//对按钮的外形做了设定,不喜可删~
btn.layer.masksToBounds = YES;
btn.layer.borderWidth = 1;
btn.layer.borderColor = [[UIColor blackColor] CGColor];
btn.layer.cornerRadius = 3;
[btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
[btn setTitle:str forState:UIControlStateNormal];
//重要的是下面这部分哦!
CGSize titleSize = [str sizeWithAttributes:@{NSFontAttributeName: [UIFont fontWithName:btn.titleLabel